Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd05d358f3c33ffd…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 12:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b983a9d1311f1d3efd1ed97538a1d4d9 SHA-1: 7c8d87e3e8040d0fdc16518fcfababf4e5ecf148 SHA-256: bd05d358f3c33ffdedef6ad36d417fa2ce65fe96a1beaa244dccbd569fa65ae7
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. The presence of a 'Callback phishing phone lure' heuristic indicates the document likely attempts to trick users into calling a fraudulent number. Numerous URLs pointing to potentially compromised or disposable hosting were extracted, suggesting a distribution network for malicious content. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or trick users into executing further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://valdhans.cz/userfiles/file/tiduzosonuzelowozaxa.pdf In PDF document text
    • http://gamjagolla.com/uploads/files/vibitosel.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ocgcc2kt32opmbj48ub3jpf6h0/nevixitelafakexafofilaxo.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/50047843648.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c9eb02e1a---tupazitotutiziz.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/59321679566.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/supepipon.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/91148438729.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/kerukagi.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///ritajosenulowokezusumo.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/47858021040.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e294aaf6d---jebijalimaxawug.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/bawokakijemobutelom.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/toxekujibawifoverejuviges.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb9a1a12bd3---74835252422.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/27048577385.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/77716057903.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/06edac373a6415667df8929d46cf9703/72794886640.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/bhp1vo7a2enouruggrb773omc7/bavovuleredo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8883830c---87975873803.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/gasutawimoxaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hipotiroidismo+y+tratamiento+nutricional+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_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 10984 bytes
SHA-256: 08b0171ea1ddfaf937de03a4a4215970c03a1bbe563a73dcd99c64a105f14149
font_01_sfnt_off0000f9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 18220 bytes
SHA-256: 299b359b254767b83cd4ef28819d4d780edb22cfad27a53b7f6900bd073d7e44
font_02_sfnt_off0001277c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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