Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a0a46f2bebbcf3…

MALICIOUS

PDF

92.0 KB Created: 2021-07-02 09:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3622a1d63ff7ae7ac8bf7adad1a29f5e SHA-1: 136b21502dd2721890ad1137e6aca8626bdbf792 SHA-256: f7a0a46f2bebbcf33415aeeb9a750af3beaafe329d6f39b8efdca46704db11c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to exploit users through deceptive links, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/ka06gubg0ts01vb49frr337f97/sukenumulogev.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/m31c4bpot3i0f77vf529de6h48/73818495693.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f2053fad91fac7d0d6c4a2700cea7e26/38429672779.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609435df866f7---jinilirademikopilafa.pdf
    • http://hosungtour.com/FileData/ckfinder/files/20210528_31342DDE4D97DC8C.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/1f4fd873cdb19bdf30a542a945fcdea7/20717511169.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/788df712e124f5ee547d06f0d390734a/61107826822.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d1cedd6e3---bivosedadenevexukixavipur.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/rivepomegibijo.pdf
    • http://divodizain.ru/ckfinder/userfiles/files/jemelelasix.pdf
    • https://faresaldabbous.com/uploads/files/10310456176.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6d28c941---naraxirosojogu.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743c510a4b2---jilolek.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/eguha8m6h3s6a2ke7l4b81h989/rituxipekirusorimagunim.pdf
    • http://marinapogon.pl/upload/file/33411300682.pdf
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/20698955531.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4d745e459---wimuwevenaraxuvotuda.pdf
    • http://biotledlight.com/userfiles/file///31270694585.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f8a2129b1---maxoje.pdf
    • http://altiro.nl/home/tjerk/file/kawavodezitureluluzumifek.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/15echapg8umjm73m1apqc2r6r1/pusexeruvevabil.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/22982319864.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a01a5c4a8---kabelawofedawuk.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/65af247c36a08b4138b51b7466638548/53302486014.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aadb66311f6---dufewezixunonanobis.pdf
    • https://olterus.com/contents//files/86746085338.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=minimum+subfloor+thickness+for+ditra
    • 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_off0001003d.bin
aadda8c931603ac9b73dc0bb28b8e0a340a8ae4f3307408fe113dc12996d843b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 18756 bytes
font_01_sfnt_off00013099.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13099 16792 bytes
font_02_sfnt_off000148b0.bin
6e51a8bb9dd9dc35c0e219656f33b54067fa234e3c04d3719f302a96f119f8c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148B0 11068 bytes

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