Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56c4460828c1a13…

MALICIOUS

PDF

108.5 KB Created: 2021-09-02 14:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 88f09c863d5ce664f35e555c59afa746 SHA-1: 97c7752a327e39d856618f43823ffac6edadeddb SHA-256: f56c4460828c1a13aab9bf1426ca2f32927a5540682626420cc2bfac4c1c8765
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised websites and exhibits characteristics of a callback phishing or tech-support scam. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content or solicit further interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • 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://infrive.ru/uplcv?utm_term=bobcat+forestry+cutter+service+manual PDF link annotation
    • http://pluimveebeurs.com/userfiles/file/gibegedujoju.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/wowanetegezupijaje.pdfIn PDF document text
    • http://valeneighbors.com/userimages/vugilogosevofovimino.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cc87ff2b92f---19226808854.pdfIn PDF document text
    • http://beymersan.org/upload/files/66724578237.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160742195c2424---19467856735.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e3f0a9f36248c2c24cf7f9f40ef1efc5/31728004474.pdfIn PDF document text
    • http://bakoca.hu/files/file/jofogipezidobipoveniwuma.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/demazo.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/26180670596.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098bb9058f6e---80004695504.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/14562408903.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a2e3ea2ef---jovewomufomekiga.pdfIn PDF document text
    • https://2acontractor.it/images/file/86129224533.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8c1b85a1b---juzatarenitiwukaditaxob.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/zomifigakexawipa.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eab9c70cb3---mexazudisirakotin.pdfIn PDF document text
    • http://abpaluso.com/upload/file/39624819769.pdfIn PDF document text
    • https://alutat.com/data/file/noribuvudasokud.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/94651000147.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/lufugiro.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607573dd58aee---linojagetopegolijesanu.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/kopaxamaforatapamo.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_off00014254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14254 10968 bytes
SHA-256: 56a6f78b2b4ba7c61022c88231262ac1b7604fe71163071006de6cf1f11c259b
font_01_sfnt_off00015be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BE2 18284 bytes
SHA-256: c8812aa48873d686aa8b28262e71298a55344736a097964da82b735e0839fb09
font_02_sfnt_off00018c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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