Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadb3f2c9fd2b529…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 06:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af2f5bda1d58ce64245705245335213e SHA-1: 1d4d3798c1dfda79005a11b108ade27c618e47be SHA-256: cadb3f2c9fd2b5295e1b1d2762c48d763b8b76574c5a6b076c6b1e905e2aed11
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URLs and link farm heuristics suggest the document is designed to redirect users to compromised websites, likely for phishing or malware distribution. The 'SE_CALLBACK_LURE' heuristic further supports a phishing or scam pretext, aiming to trick users into interacting with malicious links or content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nomylo.ru/uplcv?utm_term=virement+international+bnp+pdf PDF link annotation
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dae141c37e---bonosoxukovosovon.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/19497748486.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210831061916.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/73577465741.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/68594078845.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954f927814c---92306123782.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/49033114713.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076bb43437be---91894214713.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/wigewi.pdfIn PDF document text
    • http://ks-puyuma.com/CKEdit/upload/files/ladexurelegoworojetegizal.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/46971573364.pdfIn PDF document text
    • https://pavimenti.pl/web/uploads/files/79532690352.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/7d717217ca94ce354aff4659251bde68/linuliwet.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zikigodegitubuf.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/2134885654.pdfIn PDF document text
    • https://melz-feu.ru/upload/66114643275.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/96247992144.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68411d4e11---famominub.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090efe7bbfc6---58618194248.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210826122538.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/85423815552.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/761475009.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_off0000e019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE019 10600 bytes
SHA-256: 4591ca1c7c0e3ecb570567b0833cf1fe5440e57047b758445f7f926267228baa
font_01_sfnt_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 19420 bytes
SHA-256: 870f86b2cfb42233d56f2cc7c569455b4de3cd27438f28e0633d3e037f38e83d
font_02_sfnt_off00012a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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