Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6be531369db705d…

MALICIOUS

PDF

181.8 KB Created: 2021-06-28 23:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c31ff9b6658c3255e77dcecd1628bb78 SHA-1: cf236e9ad54e666c4e9b95b0e8b0f84a27f861c0 SHA-256: a6be531369db705dcf1fa59f0b14f38e163aa038bc4f418bb172d4418da84a65
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards exploitation for client execution, potentially involving JavaScript if interactive elements were present.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6a3e62c32---zenupaxumuruwowipirex.pdf In PDF document text
    • http://rajskiewakacje.pl/userfiles/file/65282841849.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/8e695f87aa8c0f5d5afbb5eeeb8558b4/nibugapu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bcd31b3f3d3b3239d3541dd436d96a89/40012692182.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/21049558268.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/47125318502.pdfIn PDF document text
    • http://capital96.com/userfiles/file/muzazepumakisemudinu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608184766a8ce---riselolaremubad.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e2f5158da---vonedokadusixipakabopajo.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/liriturojiligaroxojavat.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/jaguwibinevus.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/3338393964.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/57561046184.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/50328513059.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f78a34ee33---28752746100.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c736951e1---vetepewuvisilowen.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608354b032c26---xunin.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/96275146563.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a71037e1---sudatefunelixelazimok.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6a9614edded8a8ad50eaad66b551a2b4/vexobovulovogoxowobowetu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bffada41b0c---87181709543.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6d2ee1c4cdf279974814e4e88ca40cd9/60003456485.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e5c1d529d---36400277198.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/sb3i4i8tniuh9vj5vlu91beq87/54457623847.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/mixom.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cacbadb42a---36154950126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=alexander+graham+bell+invented+the+telephone+inPDF 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_off0002654e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2654E 10960 bytes
SHA-256: 39f0936689d55dd4cc562badddb769785103cb7fc68bb976652e2c12921b49d4
font_01_sfnt_off00027e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27E0F 19488 bytes
SHA-256: ab32fc9a11897e30af89f550719000e56a978971c8c1bf8977ed1d0b9532c504
font_02_sfnt_off0002b0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B0F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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