Malicious PDF — malware analysis report

Static analysis result for SHA-256 38557fb72147221e…

MALICIOUS

PDF

86.5 KB Created: 2021-08-12 09:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 94958bc8fe533885f9374e997a129db0 SHA-1: 0b1da77680fe7bbbd19db232eddde06d117a840e SHA-256: 38557fb72147221e566680176b534f0e823d1a992bb9fa290f7d5f2d3549556e
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document's structure and embedded links suggest it is part of a phishing campaign, potentially using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9816

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.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160768bed227b5---tumijevubomowobuwawit.pdf In PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/f488c6a3347239385333931101cb630e/milabexomagi.pdfIn PDF document text
    • http://scholl2021.com/clients/1/19/19bca4f76d5065ca3bffbfc1c67e7925/File/38492151963.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/287b8e2b74e69d60b5c397297feca32b/62094756919.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/38499488452.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d7a82a9a10---jetikolig.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/90637489737.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/68389528568.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/3ee334559b2a3160dc7aee94db00dfde/jowiwezirukefam.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/puvupidopidi.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/82876623373.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/32610766390.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/tixedikurogipiwisafimudiz.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/4a96a5129338b09f695ef0166958d38e/79316383549.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b733b970af7---goduxokuwinajosijanup.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/75722574034.pdfIn PDF document text
    • http://kotolantopeni.cz/file/11334227997.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/fabfba0bc3b5bcbaaf0e0ca30dbf3bd9/bowexifejoduwikore.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/wimajakajulesepuro.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/jifedow.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/59790512709.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/rebofasajozibos.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080e4876031b---tisabuvinopogedinewowadiz.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/fuzubitewajeg.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/7199406590.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160903252f3ac9---65802751987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=babies+r+us+aspen+cot+bed+instructionsPDF 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
font_00_sfnt_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 18696 bytes
SHA-256: bda9b33269b4b34701d86a09d8338ea40e54699c9f17ac0e283f1ba417b3c868
font_02_sfnt_off00012262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12262 10756 bytes
SHA-256: 4e45031c7caafdb19b602a8b542e2b5895fa78f87ae5842266cecd5dd122fcc7
font_03_sfnt_off00013b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0F 4420 bytes
SHA-256: 32418b164c91b2a10228c749f477bf982f40baa0f09d233e2e88b46f9ed01b4b

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