Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10c8eac8b4c1963…

MALICIOUS

PDF

83.8 KB Created: 2021-07-19 14:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c3067d2b8edc356628209dad5e2969b3 SHA-1: e4390f96675e82624fa6b41dc20f4481a4b0167c SHA-256: b10c8eac8b4c1963b75884f06a6ceb17fc36210ae2c02c939fd4de6f69a21d6e
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of an advance-fee scam and a payment redirection lure, aiming to deceive users into sending funds or revealing financial details. The presence of numerous external links, many hosted on compromised WordPress sites, suggests an attempt to redirect users to malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent consistent with phishing and financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://kcntanduc.vn/img_duhoc/files/mofesegero.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/wodode.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/77a62c4781221506c57c900e37dfcde2/17982465852.pdf
    • http://dongfangguohua.com/ckfinder/userfiles/files/21900469223.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/c5782fed032d7ee9dd82eaa9894c72b0/46377081433.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e02fa56d77ab0a623e3db026beb84b05/3655105221.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eb878e46e---wigosebojorutaruxovividow.pdf
    • http://leebyunghun.org/new/upload/board/files/74512202040.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54bdc9e9f4---47578492326.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/7a8bb2abda60521ac92dd7675515dc31/vitutep.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b6b516cb7b34ed4294120248090306be/92344043299.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aab04d3c4---miterojimipuzu.pdf
    • http://smartraoptics.com/fck_filemanager_upload/file/3010139615.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/c1139bdac1ab0d06b9b2679509ae08e0/foxavigo.pdf
    • https://latework.cz/soubory/dabijeliguzege.pdf
    • http://twfindia.in/userfiles/files/96898237329.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7806df69932e778a04083e9e404ebe13/37309655872.pdf
    • http://denkobarbell.com/_upload/files/degijuxo.pdf
    • http://kolasinprevoz.rs/slike/files/xebun.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5ad0a7963---43945033860.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/c2ddbb8f68bee8fdc6b082a7aecbc6c6/karun.pdf
    • http://bartuceviri.com/userfiles/file/72870163151.pdf
    • http://wisdomtours.net/upload/file/38875754430.pdf
    • http://msslink.ru/userfiles/files/17752264497.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0b91265ac---80928813886.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=457b+rollover+to+ira
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4be.bin
66f2788a18f3f807b2d246dd23d98d78c648760be9e66118926521003837881b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 17840 bytes
font_01_sfnt_off000112e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112E3 16792 bytes
font_02_sfnt_off00012afa.bin
f0e26d0497b8f7777cb95031e3527e05839a3eee5e0207604cc0c2446d72af47
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFA 10200 bytes