Malicious PDF — malware analysis report

Static analysis result for SHA-256 a50c16cb66e328d3…

MALICIOUS

PDF

87.3 KB Created: 2021-07-17 22:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4e8f56405922e3977c1d3d55fb13128b SHA-1: 1bd602ed08375f8a91fa184e58318057f6d4594b SHA-256: a50c16cb66e328d3c08b2e7a1a63c3f465c1bed251bd1c26c50e40573f078410
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The document body is heavily obfuscated, but heuristics indicate it contains a link farm pointing to compromised CMS uploads and disposable hosting, a common tactic for redirecting users to malicious sites. The presence of PDF_URI and SE_PAYMENT_REDIRECT_LURE heuristics strongly suggests an attempt to trick users into believing they are interacting with a legitimate financial service.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/ropovezaluxolijig.pdf In PDF document text
    • http://ersatzmonitor.de/userfiles/file/gekivizakotodupem.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b39fadc2ac---30869517711.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hhevj3a841nmk3se3dbsqjb2v6/sebow.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/vutodidi.pdfIn PDF document text
    • https://proxus.nl/file/91552372492.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/nig37b4s3gmp42nf9fr4jgeq97/jegux.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/50647477238.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/aee2d62fa58366c292bff59770db68ce/rosoluzelava.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f5dd68dda---zatavomulilezapika.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/vemelemozazizina.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/8hh3h8bcnq76bti2d1bu7c4e8c/81869778280.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/gabetidolaxavubovokadowig.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/kufaxarudilaberuzowi.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/nebazavuwujufixoba.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/f6qbiuph5nslimhtgluf4mnl62/38197121468.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/dugexijulotagiwiva.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1608cb2c3175e5---27731820284.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61428bfe6d---40409974886.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/kr8cvr58e45338cdnnnv2fid51/bafaxipazadedivoko.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/d1c8ae37cc543503e26a9609b395d5ad/9565891440.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/vuzekiwirelede.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a748745ac51---71596666598.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/74890342403.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/8e9d5887b2ce778e8df90ec2473de376/tizanumuzefagoxebob.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/sapamofepisubazemuponer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+check+who+viewed+my+profilePDF 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_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 10800 bytes
SHA-256: 174e2eb0dd839d6657655495c12606a1e4356338ecdf737c5c5f25daba79b2d7
font_01_sfnt_off00010a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 17448 bytes
SHA-256: 5a5e64ccf73a580ba105ef9360fd7e36148e15b6d4103f6bd46466e634796d41
font_02_sfnt_off00013796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1