Malicious PDF — malware analysis report

Static analysis result for SHA-256 99fbf4124066db4f…

MALICIOUS

PDF

81.6 KB Created: 2021-08-25 20:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2880410fbc0360853acd526a07043a0b SHA-1: e26e60bb62418aec6b8a47d541bae0f59ddacab4 SHA-256: 99fbf4124066db4f85245d680897780a11dd3a411187ab4e1d0d855ec66a6b2e
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further suggests a malicious intent to host or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://inwebjor.ru/uplcv?utm_term=electronic+devices+and+circuit+theory+10th+edition+pdf+boylestad PDF link annotation
    • https://polytex.de/sites/default/files/49271952203.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/jefomupepapolamo.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d41a1ed71d---93894202280.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/jaxadovekubebabobijal.pdfIn PDF document text
    • https://kenadong.com/contents//files/78000996438.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/8269592850.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/gabikagowuli.pdfIn PDF document text
    • http://ktcz.eu/files/files/vujutamokovopawe.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/9402167760.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/towubudigifogowu.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/10177603904.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef0e88762---66389083099.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/zimedumulesareboxi.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/81893870055.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/puxitawi.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/fovogaramegikinenadabexu.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/12676671380.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/vilosakuvokiguwewa.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/navovoj.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa62e0d76a5---43016308835.pdfIn PDF document text
    • http://ashioke.com/images/library/File/terajadijifa.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/jerimilet.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/45477458154.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210520090908.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/97284588353.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 16348 bytes
SHA-256: c25e1996cbb3542c1addaba57dc2bf5a4a9ea79d3eb49c964d24cf72e0bf26f2
font_01_sfnt_off000105cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE3 11292 bytes
SHA-256: 187bc49f1088933fd1df78c59a100ff668e9252da8d1104bcc5ac9fbd04673a4

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