Malicious PDF — malware analysis report

Static analysis result for SHA-256 eee0acac1d3f5ca0…

MALICIOUS

PDF

96.0 KB Created: 2021-06-27 02:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1eace817692a561885166f504f1bbcb SHA-1: 71a21b1309fe4b970143c9d97a30bc3735f38eeb SHA-256: eee0acac1d3f5ca087ae52a10fb961dd5d320621374b7cc2df9fd93d5d33fcf7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting it functions as a link farm to distribute malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://smidgel.ru/uplcv?utm_term=anthem+of+the+heart+english+dub
    • http://lpkgoodframeupvc.com/userfiles/files/17250713522.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/6c1ff1e05f405d7c9b283bcf4465da0e/wizuvapawuzixikejisija.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/39a11b8bdd936d3c8e2cf43874434dd1/vawidegedifafaxa.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160909f9c79317---85330705393.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/hmk82361rhns9slup2ike9on97/xisepofevab.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe93e61913---73599653811.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/221b2f2ec53abb0c6a508198378f9b00/posototubowoparewifijoj.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609773700e6f0---rosotirivebebunefefad.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a43de32dd5d---85995578093.pdf
    • http://cephedanismani.com/images/pages/file/wizuda.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607723bf7e357---nakeminimu.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/10caea4b75defef062f0fed90169610f/zererubefemewob.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607277a3bc2a7---navotezezekigepexada.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3644a32aaedac13a29e6d7f2ea451b25/jogabevisefa.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/7529f8b6527ca6b8fee352d1e3bce6a5/46308021787.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1660680825609fc26519f8e.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/pcnqi9lbenkb1g83t0b21b5v9l/1082694971.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/6luluqqm0o79mgc8dqij21d6c1/71386974450.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/4i4omalsv2b743idpp2iibh8ph/45529994889.pdf
    • http://keyflounge.nl/userfiles/file/37860636151.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607695e695479---74343741182.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a6ae7436fd41e62bfe5eb61a76317e04/zawilineravugasuwusa.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e394c5796---ruzijewojefabuti.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02c.bin
864bf6f56210841bdac37ed358f1b7ef6d3ab3f2abbec2545906a3ee070e1637		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF02C 11020 bytes
font_01_sfnt_off00010961.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10961 16792 bytes
font_02_sfnt_off0001216f.bin
bfefd3e691ac88b3021f3048439250a5aeeb091ecb49227667db251f43e8f249		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1216F 10992 bytes
font_03_sfnt_off00014425.bin
9fec5d8ca9b77248cd3007dfc6ae1957faf3f08bc2c616bb2d1b700b3e8d6bad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14425 17768 bytes

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