Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf6cc07d25feab4…

MALICIOUS

PDF

87.2 KB Created: 2021-07-24 00:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0d5ce8910b8f81db456b9abf767e8ede SHA-1: 48ad1a4d34bf96bee40bb4e926af95a20e2e71fe SHA-256: 4cf6cc07d25feab4bdb97898814ab3e5deb5df686cc441a46c3918d76cccdbca
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other hosting. These links likely serve to redirect users to malicious content or download further malware, aligning with a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708cc8a08c5---fitesevojilipejinomijeku.pdf In PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58b4087d0b---71252081836.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/1717534707.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/7916392836.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/ffaf0e057d4dddaf642bc3f38fb3d34a/texujetegupabede.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/h7ohb812kgklqa6spdnfklrup8/leroxiduf.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc5432cc3---33793368470.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/jawafazineluw.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/nitepisut.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f1822b986c0b88fc624dd6bdc098dcb8/zubakabuwowaninovefu.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/fowabubomovoxo.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/15750212688.pdfIn PDF document text
    • http://klefmarken.se/upload/file/nixezaromuro.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/647e2224c3511705e9a00d56dff9ec1f/mimepa.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/b70ce6b3a738a42dc1d39e47ea0ca75d/todepeborozore.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/pamizuxefoxomogi.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d680bcd3bc3---pajazuzonen.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/bb23506f01b081f97498827b6b6ef3c4/66384344532.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/bobusilexe.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/53a478202744b971d7c1fb5783679edb/kapolarerosifuwobunabi.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160cab3bc75918---namagelosod.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e59d1d3d3d66269c6e8583bcdaae4d92/98704790762.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607898abad64d---54571213127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=are+holiday+barbies+valuablePDF 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_off0000f2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CE 16352 bytes
SHA-256: f93b64aea06ecb499d3ab0641811d3c5dc429f01887f38d56ec23ebf61baf731
font_01_sfnt_off00011ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F9 10544 bytes
SHA-256: 33d371b475a390451998eeb0a69bd07b4b9ae81ab010b137e1527ba37aa0a6a1

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