Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fa6a4655c63698…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 01:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1b03213b5d3fb36eed7f5f1b9c6f48d1 SHA-1: c8dc7c1dd1bba1eac60565e9927de3b4a2a57e27 SHA-256: f5fa6a4655c63698a0e821f9812a02cb5ad301340e72cd65c83735162fed226a
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The PDF's structure and embedded URLs suggest it is part of a phishing campaign or a distribution vector for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fvv-hohenfelde.de/sites/default/files/files/liwelixudetezo.pdf In PDF document text
    • https://everestart.com/images/stories/file/72377341495.pdfIn PDF document text
    • http://kite-surf.sk/files/busidewewaxusisopinizazid.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/44726458439.pdfIn PDF document text
    • http://orem.mn/uploads/files/ratalununafemurovuk.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607611ff97d7c---79769063320.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1acfbd7b6---duxezixibananule.pdfIn PDF document text
    • https://dietacud.eu/upload/file/rubofisasafijojurer.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f0fd11f8d8dd4e4e97b918c6f13fb71b/nopepodu.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/bctd0kl0pg84rck0gquu8bh39l/62678381273.pdfIn PDF document text
    • http://vasamo.org/pds/userfiles/files/zozaxokeno.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cbd3541db---sazapolisojufu.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7c12ca3421ac0d175a3ad2009c1cabe9/rerinaz.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/ecb58819bb1eb89091d950f5e3054dc3/31435227666.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078330675702---vufuwebadakelokezuridara.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/10a292c05afb6d2ac2ddf9ffdeafada8/92114415152.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/327397c62a71b8984700d39d3afa2d77/27900765138.pdfIn PDF document text
    • http://splogservice.ru/content/file/vufofuvaninotapuxisifujan.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/d82c9a7c0e35b3e7d0d3735309f3c29e/vuzevotavix.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052102530571.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/bonivalulokivamudetep.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/xupegipob.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/3fe0b75faf368b4ee1abebd5dc74603f/gorofoxofisota.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/wolezarage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=watertight+marketing+pdfPDF 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_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 10696 bytes
SHA-256: edb2acca2c227ca937a7196059027eba05cdfd8c3d56cadc8f289d68b83d1bea
font_02_sfnt_off00010d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0C 17792 bytes
SHA-256: bbf7505883a33316ca5b59514215ee367c1417dbe197318e4b669319ddb6ef65

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