Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab699aeec752c0c…

MALICIOUS

PDF

135.0 KB Created: 2021-06-12 00:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b884115b67f55fd66ee258091de9e8a6 SHA-1: da548b50f68f73fe6234fc025fae18139a015dee SHA-256: 0ab699aeec752c0c90801535278f4adfe0bcaab0f1e84b11e168ae99c2f9c032
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, some pointing to compromised WordPress uploads and others to link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download' button heuristic further supports the idea that the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/uplcv?utm_term=ooad+questions+and+answers+pdf PDF link annotation
    • http://111-orte.de/testarea/cwsCMSlight/media/files/texigowabegafo.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/siladomuzigexonulimezope.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4269a022fe---dupunisemolalomu.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a46f9ae553c---xejotaronidiserexazirab.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f214a55a1d---63933712550.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/846113c1353dbd601a1d22731201f39a/fikoxepikaliforoxitomiz.pdfIn PDF document text
    • http://jarosi.hu/files/file/71630135844.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9f8f420f6---76280986984.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b38c0e4c60d---bepugozamavurilagaf.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/1be3ab4086c0352b336cef9fa7dbcde2/14281210481.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/46330842749.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/javadibowipibodakusisegi.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6c52d6411997e66b45bf340711001ba5/fukomuzu.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/26081702752.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/xupizebiluxagivixafe.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1675b3ed77---19200402033.pdfIn PDF document text
    • https://avenue102.com/uploads/file/demuroxowamuladomaj.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/9dir3kobg173g6jo20r3it42s3/38810288725.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/zoniguseseru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://fsf.org/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/philosophy/why-not-lgpl.htmlIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001e518.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1E518 17196 bytes
SHA-256: 0c5f4197364fddfd12a23f314daae8d735e030e6485834c7e24447584214a912
font_00_sfnt_off00011e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E14 3872 bytes
SHA-256: 0d7119750acfcdf39e3b9bbb3ed4b2564ad0f5d33af04e8d8be0b813024f2c2a
font_01_sfnt_off00012ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA6 5248 bytes
SHA-256: 44f22c08ebf2fc781d81ed612cb4f8b43336bf2d0d471a59fea4e5b3413379bb
font_02_sfnt_off00013d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D94 109704 bytes
SHA-256: 6112c55891c5c8f72e357f60f5e104d9d0c02648f4d7c789934f8959036c14e8
font_03_sfnt_off0001b249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B249 15384 bytes
SHA-256: 8597093c12a829be45f76a00f41460980ab784eb4dd1b227e8cf34dd4877e989
font_05_sfnt_off0001fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD92 6240 bytes
SHA-256: f94677e97b345c4a7791a48223187e309c819a5440582113975331d74615ae77

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