Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bff3e5b710829e4…

MALICIOUS

PDF

83.8 KB Created: 2021-07-17 23:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 28f30e775893efc2548b8055408f2a61 SHA-1: 8f93c1d6826946fc15bb4c5b941bab7bfdb5344a SHA-256: 1bff3e5b710829e4265fded16d39e24737083872ed6da084252154c8beb3e171
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating it is likely a phishing or malware delivery vehicle. It contains numerous links to external resources, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the overall structure points to an attempt to exploit users via external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://andana.us/files/files/jazaxuvov.pdf In PDF document text
    • http://sdds.be/userfiles/file/vezawevadu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed3716a4e---kakewoziwuvesuperijuf.pdfIn PDF document text
    • https://afayl.com/userfiles/file/56199936651.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae866048d2d---18577292595.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee252552e3a---26482581831.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/313096a3c0b38601c02693a8e359f363/zejujikazaxerorosa.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/pdr81dhml7nno03mg4ji4f9gu5/59652895957.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/zivilakodalekediw.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/39812241979.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/belaveja.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/lonenoz.pdfIn PDF document text
    • http://baudoinfamily.com/clients/f/fc/fc66627f90e8a365851b026dcf169025/File/welemibajaxuwanipulanalad.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/dc529b746e2a369a7419f08158277061/jasavopiludif.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/93476499453.pdfIn PDF document text
    • http://quaint-house.com/wapovasibakip.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/89313579506.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/93998596371.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/b954d5dbbc37a86a7361127f84d1dd69/51673887114.pdfIn PDF document text
    • http://elm3rad.comfile/49595377380.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/e94c8b9c840002db032e39379f4e6e47/38937628033.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ea6e28d9a11e528eee1cd710332c5082/jonasujirutirami.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160beec4cb39fc---jupojokojejozapidepegifa.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077ec7d338be---wikogaranosut.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/silotekipunaberijoxate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=it+is+well+acapellaPDF 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_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 18116 bytes
SHA-256: dd52b8b117ba7a768b4097c989772b2af810f5c29e8ace509d356c5d957e649a
font_01_sfnt_off00011369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B80 10080 bytes
SHA-256: 48116e845e4bf4fa1686915b5b027847209e876091ea7f39b3864841c3b7b599

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