Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bce3a7adc360bb…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 03:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db15fc6eb364424c701bb888f6cea257 SHA-1: 83bc73a77a6232133a5a54458c502b8e314280ba SHA-256: c8bce3a7adc360bbdbade150157af334a823a1010ec2f0a580f392ee4131c1e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress upload directories, indicating an attempt to host and distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bdf45b05fa---49063603045.pdf
    • https://huanghecables.com/d/files/kekixozizimix.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5301f312---51634421994.pdf
    • http://pretaporter-pegah.com/userfiles/file/litatevekamejixe.pdf
    • https://juniorclublivorno.com/sitonews/images_upload/files/3378657587.pdf
    • http://kubkao-kubpla.com/userfiles/files/59081051033.pdf
    • http://av-jet.ru/userfiles/file/9688726150.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/65c751c869558a9e0bbce7646f1329a0/zotek.pdf
    • http://ikra-ekb.ru/files/fckeditor/file/98284761089.pdf
    • http://tobn56.com/UpFiles/file/bugojixazavifik.pdf
    • https://bosgo.mn/uploads/files/25361274663.pdf
    • https://wspaperbag.com/userfiles/file/45854633576.pdf
    • http://ourpreferred.com/userfiles/files/wasisutixafesofulu.pdf
    • http://alburigiott.it/userfiles/files/92548090350.pdf
    • http://samnakthodrahassob.com/userfiles/file/76704587734.pdf
    • https://ap-qatar.com/userfiles/files/72772708692.pdf
    • https://masteranalog.com/userfiles/file/kepopekufesulusi.pdf
    • http://paroissedementon.fr/upload/files/82321339823.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/b8b6036641395d8183f946141f86356c/tumanesezemazajerugu.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614af3700ae6a---63175216980.pdf
    • http://iuf.kr/pds_down/files/12235144689.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/4db0ef5bf6aa400d419a5dbd5b1ac8f5/67627796612.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pokemon+soul+silver+randomizer+rom+download+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b161.bin
39f5772853b0d4197c9ec2a80ffe0025ae59398b1281addf5b382907764e4009
pdf-font-stream PDF embedded font (sfnt) at offset 0xB161 10716 bytes
font_01_sfnt_off0000ca0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0C 16792 bytes
font_02_sfnt_off0000e21e.bin
7a78a5c789a5637864a0209ff001517a243bec05b74f70b6ee18b9271e08e2b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 16536 bytes