Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b168fa901bccbc5…

MALICIOUS

PDF

130.1 KB Created: 2021-09-05 16:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 928b17acb648b88e374d1f1165623cda SHA-1: e8a8eb07f0c2fb932de653916c5bf40122ace005 SHA-256: 8b168fa901bccbc59465e890f94c910e0a7102bad68e688144a89d816ece0b87
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or redirection mechanism. The 'SE_CALLBACK_LURE' heuristic indicates the document may be designed to trick users into calling a fraudulent support number, a common tactic in phishing and tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://polaria.cz/images/file/zunafikobaferutawemem.pdf In PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec301b7806---75402027437.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/37295390518.pdfIn PDF document text
    • http://chromatographvials.com/d/files/90629657853.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/lisukotogudidituposix.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126a5bb7f783---molewimudapuxotanivawux.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/gozuvijotat.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160932ea3195d2---12221806765.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd406b4c88---meninuvenosu.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/5477ef5597f3cbd6875aca52f916e987/44047255134.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/90638573593.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075cbaec4899---nataw.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/tepedojukufepapame.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/843228d32884a385c39d4deaa6795044/73712515087.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/xezaxuxenifumukuwikenan.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/08-26-11-17-20-30.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4917f292dd---92422148900.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c8999f78ea8---915301883.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/8bd7e297ae5255425e52c685da9039da/wapovobad.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/17227585185.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/rugixazurawa.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de15b4b4c8e---zudiroxonuv.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd8e9baa49---mefov.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/wizija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=crisis+prevention+intervention+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_off0001965d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1965D 10380 bytes
SHA-256: e43e946cd6ac7548039754310193813ef928ed57707d949a3b70cb53566f6ba1
font_01_sfnt_off0001adf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADF8 20184 bytes
SHA-256: 143574ba43b010492d430916f2579f1eb2d3e443c200ef3bbce2b61429ef6055
font_02_sfnt_off0001e21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E21B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.