Malicious PDF — malware analysis report

Static analysis result for SHA-256 42cfe2a8edc659ed…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 19:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23f452f62448aed830322c95162b47b0 SHA-1: 144e513db06428166300fd9381b5cfd485cdd8d0 SHA-256: 42cfe2a8edc659ed4ba80397dbc4ac5420a9ec6d0b2921bb8ec5d0b5de3205ca
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to trick users into believing there are new or changed payment instructions, a common tactic in business email compromise attacks. No scripts were extracted, but the PDF structure and embedded links strongly suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://pointerboards.com/uploads/admin/files/sovemoje.pdf In PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381d403c3da---xapukubetujesinon.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/gegiped.pdfIn PDF document text
    • https://mar3ol.com/Files/files/gimaxoridowoxure.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/94828513506.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/legajaloxowudumawigeromu.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/58533526859.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/jodafuduxewedav.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/suxem.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/58618031967.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/9ae66a80f82c854e889dc4fe82f09762/pupakenamabapotuzobevog.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/ludewepodowobatos.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/94795102954.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/salipamirezixagoputipome.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/52a6708a935e7a445d3ac80ab3aa27e7/dixor.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/jolujulesi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o72ejike05s5snltej1jtj7ph2/pavurabemosomama.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/17183791198.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/58879759443.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/83004928216.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///buvogul.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/70595651360.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135d4856cb63---38272494119.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/23227899361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=battle+ground+apk+downloadPDF 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_off0000db06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 10640 bytes
SHA-256: 3da807eeab151ac00312e0275fcbbcc98e2f8712ad7bc25dad5f0be97e7e6c7f
font_01_sfnt_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 17868 bytes
SHA-256: 62cd2a0f07536a4b707058d40aa4baf52356e9d7f63ae26f7eca9cbebdf07bde
font_02_sfnt_off00012171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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