Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0e03ddda16c982…

MALICIOUS

PDF

67.7 KB Created: 2021-10-02 16:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9756ab11cd8c8f1f307feb9fcb2c63de SHA-1: 78966cc7230a4f44f55f19e031e3ccfa3d391b92 SHA-256: ac0e03ddda16c982ede978783e32ac6a45b0a512c5de0051d396e4332ed209df
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with clickable actions, typical for directing users to external URLs. The numerous embedded URLs, many hosted on compromised CMS platforms or disposable domains, suggest a link farm designed to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • 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://philabc.ru/uplcv?utm_term=i+want+to+go+home+song+michael+buble PDF link annotation
    • https://zegaoyun.com/calisma2/files/uploads/86879963689.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/22311977697.pdfIn PDF document text
    • http://www.siposferenc.hu/html/19772006732.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/49446580940.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/8332595941.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/34948438185.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/80756648669.pdfIn PDF document text
    • https://www.patisserie-flechais.fr/ckfinder/userfiles/files/81612964502.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133672d5ebbe---29449801835.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/47768419933.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/72386089408.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133d9337d1da---xepidisupe.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/68116907109.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/52636842940.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/74569557098.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/28733369696.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed525439b9---rexisibifewubototejo.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/38829159369.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381353e02b3---59947285515.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/42530277353.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/58072028678.pdfIn PDF document text
    • http://gibisch.org/files/files/81275779916.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_off0000ac77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC77 14532 bytes
SHA-256: 09e2f038af252418801cf65a7172c8a32c9e4f86ce75c853c52deee3767641cc
font_01_sfnt_off0000d071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE888 10856 bytes
SHA-256: e415e7e9bbc0c5983b61f918afa9d91141b2238d4d7629a7af848033f972095e

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