Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c00a5220d77140…

MALICIOUS

PDF

85.5 KB Created: 2021-07-01 20:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2cca5fa97a1fb61900d58569a22676b7 SHA-1: 13a2596e2d28d95084e87f309841ac9350749811 SHA-256: 78c00a5220d771405aa454fa3a59c70bdffc6d411ee968f638ab26d67ab96f94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • 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.
  • 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 http://xn--80aamdqpfpr.xn--p1ai/upload_picture/23895743223.pdf In PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/zajugeja.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/mkpllue3ragcm486j57hunfu16/xivetijavodatalema.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84b6baea4---85204415958.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/cdd2621072881ce2f07388e1a578cd2e/30808662721.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/pitopagovomupizupujep.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d44768ea09---42786943923.pdfIn PDF document text
    • https://eucolait.eu/userfiles/files/witulozuxu.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2b6b90696---lefanisuvomitugajoti.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/lomewuvojazifox.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f34bad36a2---25690065330.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/79080237052.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/783908731a636ff03cdcfcd2bd24d252/tumawakujezare.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4571a3a14---14537745596.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/19942629591.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/jiwizabefujimubawex.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/miselosoxakazojitamil.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/dureworexuloputolitubepo.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/58420489670.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/koradifuk.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/vupila.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/89476354117.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/59416038097.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/tetozorazixul.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/juligoxumimulefudira.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736f7674972---64194808507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+fly+a+kite+with+two+stringsPDF link annotation
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 16176 bytes
SHA-256: db0a34182d4bbd70d86981cfb4937aebda0f6c2f0264df53ed75a339761d2cc4
font_02_sfnt_off00012f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F73 10776 bytes
SHA-256: e870612d21b57809b76c21c88164381305165f1feb4d2d19d63be02ff1026b43