Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46a37c45b513ece…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 01:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf5787d8f33384776b226146804786ee SHA-1: b7bef974650e5388f4773e19b27c64bba0be4a4a SHA-256: c46a37c45b513ecef806f16df36e1623f29886f9ca5448d59773d76cea9c4489
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits numerous heuristic firings related to external URL links, many pointing to compromised CMS upload storage. The document's structure suggests it is a link farm designed to redirect users to malicious content, likely a phishing page or a downloader for further malware. No scripts were extracted, but the high number of suspicious URLs indicates a strong intent to compromise the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • 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://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354b670119b---woluxudanodijov.pdf In PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/95032829317.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/tunufi.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/23478773602.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/madexitijanatit.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/70973888635.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4ec939e10---71692128655.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/sawafegutifumagixowar.pdfIn PDF document text
    • https://zhansq.cn/upload/file/36262392286.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/40873570298.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/bt43tt2ef39d8nf484mbv4c5hr/306911835.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/titosuvikojujavusutefa.pdfIn PDF document text
    • http://fittbikese.hu/files/file/57160197045.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/vigusisegaxit.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/86834367279.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/sofaxo.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/vipoxokesuzosukitis.pdfIn PDF document text
    • http://robedecreateur.com/img/files/64208006802.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/fapowopejiz.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/331b59a435c69d5f4f487b1df2197a27/pusodazavinavefibubuxirap.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/bbpavtkrjpq91tgq7bp3it8770/61941418994.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/fatokawalisuwam.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/am5k6bm373p61ra997r35vd072/pibojodusurakowaxa.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/xigudofomapekafapopegirur.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/61227419273.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b5fdbd3f398b51d17269376e7be417bf/retit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=watch+tonight%27s+football+game+free+onlinePDF 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_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 17516 bytes
SHA-256: b39c13fc94e48aaedaa6e8585256839ad3da8dfafc4aa78d25240c4b5362c39b
font_01_sfnt_off00010f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 10948 bytes
SHA-256: f1c284fcb4f606de0e6f0264878ae6df89127df6d51f35872da19da86882b9c6
font_02_sfnt_off00012891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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