Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1776df1d506739…

MALICIOUS

PDF

110.5 KB Created: 2021-08-20 18:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d459140b64129fcee1d76e0a5d38fdd SHA-1: fd12f6d5f2dc604ddb54a711e1535fbb3ab63504 SHA-256: 0a1776df1d506739388547944951fb389aae230c048ae2a3eb9af5a50308c10e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. The document body is heavily obfuscated, but heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload sites and other domains. The SE_CALLBACK_LURE heuristic suggests the document's intent is to trick the user into calling a phone number, a common tactic in phishing and tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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) 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 https://cructi.ru/uplcv?utm_term=how+to+use+itunes+gift+card+for+apple+music PDF link annotation
    • https://toscanafantastica.com/userfiles/file/71066512497.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8a4cc88d3---89513493900.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/cs40b3e1gmcjri2q2a5njhlir1/32934306345.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca942e6b97---talanavusimupezemu.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/fekavebaxuwe.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/9299632674.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/67171722039.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/18706401753.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/bolipub.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/31734772424.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///58769753568.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160876703bd66c---sitopowufiduduporifu.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/42296436898.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cb0668784---71121880360.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/vemupejuvujitezo.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/rtu317kfh1had1vncpj6h84nk1/rufoxetemufaduvimowapa.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/degub.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/zimivaji.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070feaa1ac2f---lanurib.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/943e860583215045fea97fa555d376d8/25801619341.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/bc700c6b080ef7bc1adb190c55926348/wovegavo.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/vewewijisifega.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/11493520683.pdfIn PDF document text
    • 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_off000145bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BB 11140 bytes
SHA-256: 11f738b060084d2c127ee9b0b74d8e8802d95a9c0ae2c4fe55ca0c7437be9caf
font_01_sfnt_off00015f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F91 19900 bytes
SHA-256: 0c198d1ee70c56bb39a2633353d2fb00db879fbe2800b3cc372597bb15523ff1
font_02_sfnt_off00019366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19366 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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