Malicious PDF — malware analysis report

Static analysis result for SHA-256 5674ac663bf2dc77…

MALICIOUS

PDF

70.5 KB Created: 2021-06-28 22:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d97fa0d3b53b13bb1706f1053f68269c SHA-1: 7335cf1f24cef54350998cde82560b50b25df545 SHA-256: 5674ac663bf2dc77db384029e2c4fd4d50b9abc81d46b9506b341e5086718d54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=cdf+and+pdf+in+probability
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e9b72f89e---85410339419.pdf
    • http://erdivigado.hu/userkepek/file/80151414050.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ifi3l2dnief1rmvq2mb9iin3ai/gozunik.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/sazuzumolasifiter.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/997db5822dd3bb80f12243ea8017dc14/sorapibizevukarafabij.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bb0b6f68dc4---13832844645.pdf
    • http://hesexpo.com/img/editor/image/file/33593608553.pdf
    • http://asea-admin.com/_userfiles/file/20210505192345.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715d9a315bf---bokunifona.pdf
    • https://dm288.rs/slicice/file/pimanibigexavebegaliliva.pdf
    • http://firmen-bekleidung.at/userfiles/file/salamubunolodor.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/joxojug.pdf
    • http://matstravel.ru/userfiles/file/71021871862.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ne2kpsgfb1ku89lrejklle4i9/50657632423.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c867f400bb---wofokosojovejegaza.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609993b3d5053---66496233236.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b2225edc---dumosidemojawikojeta.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd103a13f2---dokagovinosovavajiweres.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607880656016d---40155671027.pdf
    • https://himalayanthailand.com/image/upload/File/tuvogomewojowolijos.pdf
    • http://banghetretruc.com/media/ftp/file/lagorunime.pdf
    • http://www.ez4parcel.net/upfile/files/2021/06/17/98321157741.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b46810b3976---gogatovazunamisusa.pdf
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/mukobikagurakux.pdf
    • https://mediaget.com/userfiles/files/marena.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_off0000b654.bin
46e11820cf5b5e29039802e85c678a5f003f64208d0a8f91a659a5f6d8c49aa0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB654 15152 bytes
font_01_sfnt_off0000dd0c.bin
dd2a5f002e3b33fe5727e57b3d245a798687598656644c96ad6237cf0e2c3fd9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0C 10476 bytes
font_02_sfnt_off0000f4b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 16792 bytes