Malicious PDF — malware analysis report

Static analysis result for SHA-256 804c945e8e9c0dd6…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 07:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2585227131c86daa72887c7e10b20475 SHA-1: 784d0ffa68400e1413d4df25601397e17b706674 SHA-256: 804c945e8e9c0dd6e5c0ce76c01566995a8f6c3279beb950dcebde62eddf7975
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a PDF link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous links to potentially compromised websites and the 'SE_CALLBACK_LURE' heuristic strongly suggest a phishing or scam attempt. No scripts were extracted, but the PDF structure itself is used to host these lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://bajcsidavidfoto.com/_user/file/dokolu.pdf In PDF document text
    • http://pc-driver.ru/userfiles/files/60648400068.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/2394677172.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610cdbdbb4b32---10445564676.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f6f05e8b416---fajojowifipaxutaxop.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/6s7k5h9qo7m0v1869qc7s5qj94/46397266030.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824bde502b2---vafenumugexaganifedi.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/17141858020.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fa0dea38bf0---nukelukafozinudure.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/73253603530.pdfIn PDF document text
    • http://schokobrunnen.com/idata/surejabexizijezapuk.pdfIn PDF document text
    • http://gonuldoviz.com/upload/ckfinder/files/juxonamene.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/lamegekelobubuloteredaben.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/nozuwifejabujikifomorat.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/64692614190.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/gojoboxasawubeb.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/t41frj7s3frhr4ik9gth43p606/65373423815.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/15661835187.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/87547186580.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827bca6190a---26580731212.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69492270298.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/temeri.pdfIn PDF document text
    • https://aaaxxion.info/images/file/rubuwaxozisoludarile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=proposal+pkm+gt+pdfPDF 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_off0000b88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88A 10604 bytes
SHA-256: 0930ad206ce8789a1b1229d0edd2fea0dd2dcab5faea0f8017e4fe8b273c8627
font_01_sfnt_off0000d09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09C 16304 bytes
SHA-256: abd24374d88ce4e59c221fa4cb8f8222048164b0788d15c51b8305503ce60372
font_02_sfnt_off0000fa40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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