Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9ae5056f44a430…

MALICIOUS

PDF

75.8 KB Created: 2021-08-28 06:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 787278d472c31aa0ee00bd994f0f4fa3 SHA-1: 3072b4bfefda96dfbb119f69365cf0c6baebea93 SHA-256: bc9ae5056f44a430fc2ed46c885a5939d5c34f3b95413926d5b198c62c72f0d1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable hosting or compromised CMS uploads, indicating a phishing or scam attempt. The 'SE_CALLBACK_LURE' heuristic specifically identifies the document's intent to trick users into calling a phone number, consistent with callback phishing or tech-support scams. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=cartilage+combining+form PDF link annotation
    • http://mawaevents.com/uploads/file/domigesurisuxejak.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e926f18eecc---12073975885.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/gakasupowidupemanon.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/36288861666.pdfIn PDF document text
    • https://ms02bet.net/contents//files/jagidaz.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8ff93f0f14c42ce5606b5d2cc58151af/58289016802.pdfIn PDF document text
    • https://hiroyoung.com/data/files/xabakuduzovigeje.pdfIn PDF document text
    • https://schmitz.cz/res/file/80008658487.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/36921343146.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fc8426262---zumodeniki.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/jedekarodapal.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/kdecrt5bpggm7hkjmlggbrlvg0/93524833168.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/70501747498.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/5b6e9a2e82a3931070b60d8799d9ed43/34946058595.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/xozip.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/tumenekafumajadefaxara.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/95348445971.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d727ffe7436483b1196abe53d9dfdf1c/vojurez.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e82b3586843fdde198e6682cde7ea9c6/kowuruw.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16102fa0dad5a8---pajotibivadularutu.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/88219b73290eb6d7021a6a9d0a066492/28893484673.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/doxekobowuxip.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_off0000c40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40C 10684 bytes
SHA-256: c38d1ffb548542ed8dc0a2854d809e04d8c195a1483f73787f24141dca86050c
font_01_sfnt_off0000dc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 17256 bytes
SHA-256: 8c3f7cbfe25a8269d2cf673b64f1afdf977396a239453d987718819f18da0ca6

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