Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2155f8191aae6a6…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 22:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e1f9d9a57d28f1e484ae2b9cdd5b6d44 SHA-1: 394df046c7a06403882f7afbb4454282834c7ac0 SHA-256: a2155f8191aae6a6611d85e5cf99f67a0118a5754c9cf29a9e9047a553aa8dac
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to exploit vulnerabilities or redirect the user to malicious sites. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam pattern, where the user is prompted to call a phone number. The presence of ML and ClamAV detections further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 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://crysiq.ru/uplcv?utm_term=prelude+in+c+major+pdf PDF link annotation
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c1394f7f5eb50d6d3947214ec5fde18d/80180435222.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/94485157554.pdfIn PDF document text
    • http://edeins.com/userfiles/file/dimobiduzetitojop.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/46315448778.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/78032156193.pdfIn PDF document text
    • https://tekartltd.com/upload/files/lonuminebosigujobelo.pdfIn PDF document text
    • http://esistore.de/userfiles/file/josotavakalekik.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/9540f0b56ed8eb65eb9a260b1c0af2b4/70811504921.pdfIn PDF document text
    • https://reha.bg/content/upload/file/sokofozifapali.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/69157062401.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/masoluxexomibasufal.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/sowoletevuwis.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/kelomoditeludekum.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/24104422275.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/gajajas.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/57343106675.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-16-14-59-26-45.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161417d335affc---xovozuwejozorafal.pdfIn PDF document text
    • http://8njl.com/userfiles/files/87666227089.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/divezulemezaforazip.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/pojimu.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/pv0c86a76dboa0dc6tr3apl0i4/32043539366.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136672b1cf62---nupevulazuderoguvabev.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/5562378725.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/sumusipajuvukinube.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_off0000dca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B8 19524 bytes
SHA-256: 86e77a132d80c7c753c8fd48fe32b44f47c5b7292a119653edab441e1fa996c0
font_02_sfnt_off00012761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12761 10744 bytes
SHA-256: 0a8e736f7a94d4e9d2d46ce833fad20db5dc9b6a89d9f9f1d82699c5a052a674

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