Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffc1f5c57c0f44b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-07 04:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d31c3bd1e2de5c3a6c2b4a38b40a07e SHA-1: 6823017ae98a343f12c8ae2364f13a90bc150f83 SHA-256: cffc1f5c57c0f44b3c19e809c40cac85f0f90bcc66a4c4aed6ce971910260263
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to drive traffic to potentially malicious or spammy sites. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/cg1dc2gn869hcd8m7sua6tt8v5/74627893787.pdf In PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce7175da15---lekoxibafatuforele.pdfIn PDF document text
    • https://kamedia.vn/data/file/21879387710.pdfIn PDF document text
    • http://timebymtm.com/upload/files/panekeloripulenoz.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3aff85fdd3---subivewijibafile.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/2sqsi013l8h9n0d8e3acajp0q7/31547975868.pdfIn PDF document text
    • https://efnnma.org/files/file/zitifokidunenefufovod.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/garajimekumunepemibaneb.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/4i0tec6tp3lv6n3pn2hmvnk5io/21204808454.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/fijogokulogovunugitexuk.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/08394d04a9eb02af6b390aec3b3956c8/fojalijuziwakuduzelo.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/47307895645.pdfIn PDF document text
    • http://amajyuku.com/files/files/66716817720.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/64023208605.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca120a89d1---rabizokigubomid.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/xesagagujotebusod.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bb2531fff---jevarikadafumelesowaf.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093a41a8d8bf---79941000322.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/d1b7u2k956lk7jp642ib8dg8eb/xarimafexabatemijanixubaf.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/62411cb5820f28e4170a662977dff424/gobogasutajixune.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/xibilibuxona.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/lewikepagefajuvegixur.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a220ba2b577---fobem.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210626085648_hlfjai.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=rd+sharma+class+10+solutions+pdf+free+download+quadratic+equationsPDF 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_off0000dd1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1C 18728 bytes
SHA-256: 0c1f9dc3b8323f7b2fce76d47305c12ed5fe79b6af8cb86eb82af376d2ed25a0
font_01_sfnt_off00010db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB3 11436 bytes
SHA-256: 0c0e37ce29ccb2da9c1bbdc650bc4f7a3f37e4fbc1fdf9c464e4f9cacfe83641
font_02_sfnt_off00012871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12871 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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