Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a19ff7ed2cd0f4…

MALICIOUS

PDF

67.7 KB Created: 2021-09-25 04:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 268b99c1fd95830a365c631a23754792 SHA-1: 5df0f1a42d0e55667267e000892e0b7d341cf7d9 SHA-256: 87a19ff7ed2cd0f4ed3f7539e16da163b41c3120d79d8c0aafbcd77e9068d674
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to external domains, many of which appear to be compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The PDF_IMAGE_LURE heuristic indicates it's likely an image-based document designed to trick users into clicking through to a malicious URL.

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://triatlonshop.cz/userfiles/file/getememunojizobusipo.pdf In PDF document text
    • http://rococosofa.com/files/files/84645163211.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/99174263208.pdfIn PDF document text
    • http://brenderup.ro/mm/file/vesogokepopinonufejati.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/86101004736.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/fefezazuruvokekemelodimek.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/3161580408.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/59485545213.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/40944493881.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/zezekuwopa.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/45325140160.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134e1a565c4c---misejapenebuvujokagor.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439d029cd7a---86180257495.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/nizirisenusuwofez.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/61204978839.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/dogebizovezidotesetufej.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/kapowujanogof.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f184477574---xeruvasutexuboxulogenaku.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/xasasorodovukuse.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/nerujobuvolubunegajonag.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/49228556534.pdfIn PDF document text
    • https://mytopics.it/uploads/file/mogeduxivaxutuzituvaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=powerpoint+app+download+for+pc+windows+10PDF 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_off0000aca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACA7 14064 bytes
SHA-256: f8ca4fccb8bbe7e5b8c783ae57270b529e4cfe521ba3925444f34bf1d1cf8d44
font_01_sfnt_off0000cfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCF 10872 bytes
SHA-256: ae3dcb4137316e6b7e527650676253e24f59cdd0df0ffaa12c0e84fe29cfa447
font_02_sfnt_off0000e924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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