Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf56f2663c0611d…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 13:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 74fd58b47df030f49d511f26dd09aa71 SHA-1: 3748e71a0d8d6160ff86cbb99623339bbfe0a216 SHA-256: fcf56f2663c0611d9587febd1bffe1d15e254343982a491e35abe1ae766413fa
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to compromised websites or disposable hosting, suggesting it functions as a downloader or redirector for malicious content. The document's structure and the presence of external links are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=materials+science+and+engineering+an+introduction+9th+edition+solutions+manual PDF link annotation
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a139f0a0ffb589042854cddb87994656/51823410836.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/fetumomanoxubonagi.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/89163783222.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/42938533481.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/fa58fb6aa946d29d020d056ff841887d/94244688547.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/zilenupelaniratatonifam.pdfIn PDF document text
    • http://wohingltd.com/userfiles/49514368432.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/54902182299.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/77002085992.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/purivakopagivugik.pdfIn PDF document text
    • http://haki.vn/uploads/files/7555785135.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/60025981453.pdfIn PDF document text
    • http://polipack.ru/content/file/jekazusuni.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/38938148320.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/jupabuxapel.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/noritufaweresada.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/31386670587.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/menafimibufabamamanuwezel.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a4610eebeaa152973e5d7821b0903194/serezasu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16134d9fc0af0f---14849488697.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/rubuvanomejajomomil.pdfIn PDF document text
    • http://guchen.ru/d/files/57689555417.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/mepogepuzasifiwov.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109081511389065.pdfIn PDF document text
    • http://short-story.ru/upload/file/nevogibolaruxotute.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/tezotanakipuv.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_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C1 11076 bytes
SHA-256: 1068d62cdb84e989fb225743760cb278ab0a67f71df079cee58b282750066621
font_02_sfnt_off00010b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 20940 bytes
SHA-256: 87703d98e92402b0404755ba9f7c4cf73333dff8f392d9f0a1aa5bfafc16df61

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