Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa8424ffe4c6121…

MALICIOUS

PDF

82.8 KB Created: 2021-10-07 16:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bc0736383b5aeb4321cd924cd21e00a3 SHA-1: 9776ccbdd1af776d5ae86e768a0858f7fa4e9f19 SHA-256: 5fa8424ffe4c6121f374f50d2cec2170205299a7fa4559f3c05cd83e2444f73d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised or disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, reinforcing its role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.gesas.it/media/mailinglist/file/gapasawigas.pdf In PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents/files/wafegunonakirudujafozadu.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/lijudotozuxasu.pdfIn PDF document text
    • http://slsnn.ru/content/files/kivazewavomugevolerixikis.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/vedexoverajovovifitipuga.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/5022112633.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/50214272791.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/57076334169.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/beba45d28c7806f34f6978818c266581/82974264364.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/80320217331.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/reberafilezagifan.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161507ae70d82d---64712589883.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/sajinirenapisekuvure.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1615616db495c1---zotuxarusijage.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/6755593095.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/71617099918.pdfIn PDF document text
    • http://wych123.com/upload/files/mirojotijupatuxu.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/jezezegigo.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/gedojojedebizedobinaw.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///wemiwat.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/labigejoziragom.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/dimovidix.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/savobikovukup.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/menevoxumotifefuveka.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/zofotetekitoxerox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+drinks+at+dunkin+donuts+are+ketoPDF 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_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 10484 bytes
SHA-256: 6dbb4988fa38e9b8bb63e9accb352d1e4780c474b80d4b074317d6e35a733ada
font_01_sfnt_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 20376 bytes
SHA-256: 2106362575884131d4ed0a914716cc33d15228823946c1617741b3f8f56a1653
font_02_sfnt_off000125a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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