Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce30dfd07c1da88…

MALICIOUS

PDF

97.7 KB Created: 2021-09-19 07:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7c5db0f44aba76ae0cbf7acd900c3cf SHA-1: 1979a3f865cdec05d9bb3129028dfb47ac4befa1 SHA-256: 4ce30dfd07c1da88f20a93099fe1f5e6feb7ad3464132fe22a2d3c74271e9566
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing or scam campaign. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4bfae1da8---54995619879.pdf In PDF document text
    • http://parkety-patemal.sk/files/file/vagifuviviwo.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/56403131348.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a6d8c79e---15972403869.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/wukuralokadibupugu.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/gojusidojufakupow.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/27c900dc3fa48a57b52f1666f6496f70/nalosu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133f6ebd0619---dixer.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/tozix.pdfIn PDF document text
    • http://scarpatti.com/files/36566582335.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/subomixekulu.pdfIn PDF document text
    • http://congtyvima.com/images/Download/kavafuxisuburesulevi.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/vedamogejiwefogoregolo.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/nopepi.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/nolawusekelijuweze.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/kenekoroki.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/gulopixabelamegix.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/63031978542.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/31848695702.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/vumewogireku.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/011651168185.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613156d575cba---jumuwetafanile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fnaf+free+iosPDF 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_off00011184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11184 22112 bytes
SHA-256: e7b0ce651567b4d3e2e5530ecfbe07deba04270cd4ba01446f869fe6e732e4ce
font_01_sfnt_off00014bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000163c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C3 10040 bytes
SHA-256: ff88da39488f4b47946372b7e59b2c2bae4caa7f9903ad56db6526e65f1a9010

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