Malicious PDF — malware analysis report

Static analysis result for SHA-256 5794cd042fea8d52…

MALICIOUS

PDF

78.2 KB Created: 2021-09-06 02:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc29e5aafee5db0a0593321993c61d8d SHA-1: 1467b1286d6e2d329909f9ff7efaf8e30bf4cf36 SHA-256: 5794cd042fea8d52e6712d44c9d2be5b8e8d1b3e6ac083d9de5480c113d577b5
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=furniture+catalogue+pdf+download
    • https://cuacuonbentre.com/upload/files/wezor.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607176c2bfb4b---dimikizojara.pdf
    • https://ambulatorioveterinariosismondi.eu/file/lajitezufumo.pdf
    • http://fly.no1-yes.com/userfiles/file/46206380659.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0800016ce---94336795770.pdf
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/11485003074.pdf
    • https://santaclara.com/wysiwygfiles/file/rejodezozumesodamoge.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100c2b04ac1b---10023083891.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/4c8cf399d119460dbed69492c2e3507b/34876648574.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b44954cef55---posulatinosolisoxi.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/125b3c2aace207f698a3c09cb973c301/59215965664.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/f152657b5ee228b1a68d921054fb5edb/59969074652.pdf
    • https://eminesenlikoglu.org/resimler/files/digosanosu.pdf
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210830_929EBD78C93F6414.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ab52b07a---35626702880.pdf
    • http://edu-family72.ru/content/images/uploads/file/37384947230.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c104648582b---detuvanizisowewi.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929b85e9945---jepoziredaboneje.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f4379b56281---vunilotimejizedozakuzu.pdf
    • https://decoveinvestment.com/userfiles/file/gixid.pdf
    • http://rideco.hu/upload/file/lufakepogijawewer.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ced0.bin
ecdf12dd77aeebe54a01b80e819465a34b3996e0b3f2c5f075ab9a02965d7665		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCED0 17040 bytes
font_01_sfnt_off0000faf4.bin
79c148b1a7eedf11a809d04095bd3ffabcc6c48c4e8a095647821c37b7f6b683		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 10792 bytes
font_02_sfnt_off000113c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113C4 16792 bytes

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