Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9afbef17ee2a2e6…

MALICIOUS

PDF

83.3 KB Created: 2021-06-30 18:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: de2d31d962af26f7d7ca450048e7e5e2 SHA-1: 960fcc80e8e594ddfb13ae0daf83bf9e23ecc2a4 SHA-256: d9afbef17ee2a2e6d0942e32c93acfb4f6982e54d2e5d63841dd500a5e1fa673
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting it's part of a link farm designed to distribute further malicious content. The heuristic 'SE_CALLBACK_LURE' also suggests a potential phishing or tech-support scam pretext, although the document body itself is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088dcdfb3926---97825472379.pdf In PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/209f11504359c06ef27da33884b2d41a/86893378403.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160885d8eda30b---lebivada.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/8c5df9bc07fabd38f92616fb3e17395d/warupisutupagojefasis.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/79451771333.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d3f196680---51754678528.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/19089412105.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2efe7a9fd---48523637928.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/zunebemisukefeba.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79b1a29130---kijusakulalazixasanisu.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/45775200146.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c14d461526---53693896535.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/ramuzomadobasararanikiku.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/vubebamarimaxizavipenava.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/760f6e5eb51c30e601fc7563c0f18cf3/kikaxukevupopigisagofoza.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/85565644451.pdfIn PDF document text
    • https://cutandcolorparrucchieri.it/file/42937888348.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5e928b4ec---benemopozajurerisijoliso.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/92026401584.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6468445760---taniwi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbcfce1948---4245316558.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c22509c65a---55705727040.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/gowulowitixatuzorona.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/49798543917.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/74d87da651ce921c04747cc51ebe16b6/tenigilexopo.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836996d7f3e---19935802286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+beacon+property+searchPDF 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_off0000e27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27D 17252 bytes
SHA-256: 0f4e00df08bd2ac3e9453f8a1bb0b8b2c7c1d607f293ee86afd8588a4342d84c
font_01_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 10548 bytes
SHA-256: 7c0c45ab7b8334702e48dfeaea7ab9a97d67ac1ab429f125f46d2f2c8c70cb2b
font_02_sfnt_off000127ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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