Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c495501c9c02b7…

MALICIOUS

PDF

77.1 KB Created: 2021-09-29 07:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 531199011fd628ffc859abc4c55e654a SHA-1: 11d506cb3491e378e9ebebe5768c94c3f9ae4426 SHA-256: c4c495501c9c02b7fb6f8af5e1eca19e0ca515f163dcbc34304d193d5efe4a59
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating a phishing or scam attempt. The 'SE_CALLBACK_LURE' heuristic specifically identifies a callback phishing phone lure, consistent with the overall pattern of directing users to potentially malicious external resources. No scripts were extracted, but the structure and heuristics strongly suggest a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://dovolena-jiznicechy.cz/uploads/77385441228.pdf In PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/84418011728.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/19852331617.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/bikuf.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/puvezikanogan.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/97403375048.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/51947164313.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/fugijodopupabu.pdfIn PDF document text
    • http://rc-saty.cz/gais/image/file/51832981930.pdfIn PDF document text
    • http://prmakeup.com/Image/files/79019439275.pdfIn PDF document text
    • https://harom.ro/files/file/balafozegunivopoj.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/26880177478.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/23463487284.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/25108096748.pdfIn PDF document text
    • https://dm288.rs/slicice/file/kagut.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614fed9d20f67---mawolonomefanudasivamo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/uei46hfet79bbke77jnr7kg0nd/gejamapalifovuwi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138979a27bf7---ludateviseleworoj.pdfIn PDF document text
    • http://snsi.jp/image/news_file/55607216783.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/fokokivojotobodib.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/62241879395.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/16537254619.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/55239284219.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/ginusir.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/79631510280.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615389cf3de76---38339974841.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/32c9ir7vr1kaqgju94nl7l8c0a/81755389606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=movie+soul+pixarPDF 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_off0000c4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 19656 bytes
SHA-256: 40b4e5022455f6a6884efe09e571820e0cf964525fa65bc2413eee34c20c7f3a
font_02_sfnt_off00010f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F38 10304 bytes
SHA-256: 39af6e4de8c10301dd26885bdf4a9a97cdc3995ffb242ed1a566427c2a712d54