Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a14d25f67cc836…

MALICIOUS

PDF

146.1 KB Created: 2021-07-31 09:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 92f1aa41aa443c9d11e14a990f5ed729 SHA-1: 1ae5cfc877180de1c7fe8f17e96052f022b1ef16 SHA-256: f2a14d25f67cc83664756276585c1f648545ab1d98cccec4ec5cc01f525a2d6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous domains, many of which appear to be compromised CMS uploads, suggesting an attempt to distribute malicious content or phishing pages. The document body is heavily obfuscated and unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a malicious intent related to web traffic redirection or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9339

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://www.tvmreza.tv/ckfinder/userfiles/files/sejadekodad.pdf In PDF document text
    • http://domgr11.ru/uploads/files/wutizas.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/73293458087.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/7691mu4sb80oc6m9hvjbombnne/34404617666.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/lodal.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/gojop46idnaqkmhgv4diskdk8n/19872712785.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/be790727a68738d5118e314504a260b5/94235312044.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/83475900678.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/75375593848.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef77kr3nn7etqnmkqcf8nc2lbq/44877420707.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/72515058114.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff6ebab00---bipukezutodiwes.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/466388203423ea200cfe245ff5b75181/75263974116.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/sikokokefuxusoze.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f76a37d304e3417b720a295607e71e2b/48285155977.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160900f1d6b229---68415037971.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c441ad0170---zarujisin.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9h45rfr1baeiv0om1bh5vsff82/xokemal.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/76644226881.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/betopepafabafezu.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080171f73ba3---72439011785.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/jududepegel.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/87134290476.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/fiweli.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f4422220c---19820319388.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/19456508405.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/20341948922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+are+the+three+branches+of+linguisticsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001cbbb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1CBBB 17288 bytes
SHA-256: b1be1d67ba86935c5e199b9ec707bab559a4f6495debd0c934a09d2d5e725de8
font_00_sfnt_off0001b3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E578 23328 bytes
SHA-256: b2a5b7b9875d333f2b9f3ae5a519c55877c30d35ccdbf13af8f611d340bfd25c
font_03_sfnt_off00021ecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21ECC 10848 bytes
SHA-256: 211f096c3414705def78a84772fa45c027daadc499ca70c367231bb37000057f