Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc1cfca612315b6…

MALICIOUS

PDF

95.6 KB Created: 2021-09-15 00:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 39a482ac8a3900ca75177faadea296ac SHA-1: 247853801700b815b3cb7582edc83bec6e8ec8ec SHA-256: dfc1cfca612315b6a3f65cc8b0ed1d113acc1441194efaaaaddf9eda61627b7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other hosting, likely to redirect users to malicious content. The presence of embedded URLs and the nature of the link farm heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://archism.ru/uplcv?utm_term=twilight+saga+full+movie+online+free PDF link annotation
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161335ea3f1c3c---berodopod.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/punax.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ab2ab5b121cbfc2d0680284cbe8b78f6/momuj.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/lapulipajux.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5de6d43fb---84008973425.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/20992190465.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/bbb5886313305faa15ca5f84102f27d2/20094488756.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/mozodezapewakinobusufiwit.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/2rciao97ah9r08p9k91ocjpil1/susudoxavorox.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161328b277e8eb---86375418404.pdfIn PDF document text
    • http://klhl.com/userfiles/file/nilakopok.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/19311057890.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/fuwiposoporanopop.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613572b996dc3---76179314804.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210912075730.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/zuseniruxulukiponaxafule.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/840b077984fa23c3c9e16df0f586acc7/pumepuxojizewubesexid.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/51480300638.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/zabesomolerofanogaxamikif.pdfIn PDF document text
    • http://e-sheremet.com/img/38031850335.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/04ee86d2e0b9b7e7bfda2ae474bfc50a/wesojusije.pdfIn PDF document text
    • http://195exim.com/datas/files/70457389936.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210908185113_610294692.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001542d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1542D 18224 bytes
SHA-256: 6d69ea9bf8aa0eb80339800658b4e20c5d1f398d386bb86906749210806d6ff7
font_00_sfnt_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9E 10876 bytes
SHA-256: a19145ca9d45441c3c4b5eed0cacb80288123fb83560d2b6f347605f3a6e02dd
font_02_sfnt_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 18120 bytes
SHA-256: 097111e27a63d634668809fda3dbbea24784f5b380a87dcb3eba51c4a84ce035

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