Malicious PDF — malware analysis report

Static analysis result for SHA-256 449e2a1ab228c062…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 10:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd36882b95a0583ceace3191660dd0e0 SHA-1: c59254f0d201961614fb58a63def1dcc03aca3ff SHA-256: 449e2a1ab228c062a85d1f7a0a73fbd624df431b7e747cf9e1f40691376bc821
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a link farm pointing to compromised CMS uploads and a ML classifier indicating high maliciousness. The presence of invoice-related language suggests a phishing lure. The embedded URLs likely lead to the download of a second-stage payload, potentially leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=sage+300+erp+ar+manual PDF link annotation
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/nripb5cpsmfq1lgrq7i4uugq14/wosepozulisi.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/42921413542.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/pedaretafalar.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/21753858923.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16073d8485d0d9---fawomakifawuxutemukuxob.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/puminotezadigajos.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888d428e05d---7510745691.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/bms82ame6nsgrqk2h67drjbjlv/xufuduruwokabukaxom.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/81483991422.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16109f58fbfcab---27330370819.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/76558181140.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/zerurevamemesesazoriwiseg.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/48283477590.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/naroxexizixizevazu.pdfIn PDF document text
    • http://ruihuitax.com/files/file/danagisuroli.pdfIn PDF document text
    • http://santehnika34.ru/images/file/wujobosebafurininog.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/f88nvrv3fk9np1i8iek1r90ia0/44170003946.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/sinuwigog.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/918d3b0609088e03cffcb4804937b4a3/85103386816.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/57eac46b25f6c572b4e0fd010d6fd8a7/kupiwixuv.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/7521043485.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ru8smvmqh6q499dtdqbp8sfep8/xagowalinoliseji.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b800c478429---ronagame.pdfIn PDF document text
    • https://servauto.fr/img/user/file/tibepalilepupikoboziduva.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/karomobudexir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 10588 bytes
SHA-256: a4fff897254af211495d3c495ecaa24a641ff696f1803c3f16fcbda39bc1337c
font_01_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 17812 bytes
SHA-256: 14cc70453ad4b48e4a60691402b0989203fab4b1301fb075e3bad95751553dc0
font_02_sfnt_off00012090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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