Malicious PDF — malware analysis report

Static analysis result for SHA-256 08444c34b655633a…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 21:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd1dffd171ee569453a02540959958d3 SHA-1: ad5fc664cee596ce9ec3e6e61d599d14d3b45001 SHA-256: 08444c34b655633a55c3bb47dcfa1a3f7202877dc8973d5faf19624b3bf35745
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://newbusan.net/FileData/ckfinder/files/20210908_7CE9DC23D1EB8742.pdf
    • http://obasekiestates.com/UserFiles/file/18386898615.pdf
    • http://bigcool.net/webroot/img/files/31038233738.pdf
    • http://elsped.hu/files/file/88263263374.pdf
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/fufal.pdf
    • http://infosierra.es/images/editor/88033140436.pdf
    • http://tfforming.ru/d/files/86799830287.pdf
    • http://giadinhlaurenso.org/upload/files/13793415378.pdf
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/tutipafu.pdf
    • https://dom4m.de/userfiles/files/49421355620.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d316808ff8---38428689925.pdf
    • http://studiotecnicoprato.eu/userfiles/files/venototewugowefagozonitud.pdf
    • http://neurooperations.com/ckfinder/userfiles/files/88405066319.pdf
    • https://everestart.com/images/stories/file/76013550209.pdf
    • http://ingfrimale.com/userfiles/files/zibapatubagojobe.pdf
    • http://ndc-group.ru/uploads/files/kaxanufeniwisukafetuxoliw.pdf
    • http://khojedu.net/userfiles/file/vuzizivefepawabud.pdf
    • http://broadgatecapital.com/userfiles/file/sovexo.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161353bdfa6ff0---darijek.pdf
    • https://felicityokolo.com/file/44269511044.pdf
    • https://mmtours.si/uploads/xifamipetepisulepirefemop.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141be7c22232---75621379203.pdf
    • https://srsatta.com/ckfinder/userfiles/files/bedibotatukagemakanufanal.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=lightroom+old+mod+apk
    • 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_off0000d336.bin
f308223ba0c259cf81cf1e9516771e583d146e82bc5e1fb82ddef1f0a33b9bb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD336 10484 bytes
font_01_sfnt_off0000eac2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 16792 bytes
font_02_sfnt_off000102d4.bin
8c1729f0a25b43095fa9d8fd1adda0808581be521a909b3c4aeef0bba9e3b07c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 18332 bytes

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