Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b078a3264dfa8d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 12:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65d290c6d10ca0c32f11f027bcfbb347 SHA-1: e846f424b0299802a6f08b68ff83a98384450205 SHA-256: 91b078a3264dfa8d7e211fd184e137da247da2d285659acb8935970452ed83ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the heuristic findings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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 https://smidgel.ru/uplcv?utm_term=11th+std+maths+book PDF link annotation
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/vajq23ooeosvqnsf7eaidtjg5a/96926009568.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613018ce5c269---taxusigolewuxifixaluruvax.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/vibegojeboninagi.pdfIn PDF document text
    • http://wmu24.ru/media/file/nugozefosegexexamojunil.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/tosibudaxuxezosewotex.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613967bd4646f---38490835568.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/tumibirako.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/14742516636.pdfIn PDF document text
    • http://halanmilk.com/upload/files/21747293557.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/2570479034.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/75485564501.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/31663547442.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/2816331297.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/61560760477.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ceed2504a16b27cf39e6b882e5e709b2/fuxus.pdfIn PDF document text
    • http://terminsk.by/pics/files/86101473561.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/21623503535.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jorijodonanafajelot.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f359eb6436---fiwibitoma.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/sogujasaletobi.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/54202073730.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/10408775874.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2e8d5b9abd3429221af66484ef8c0a23/61443906186.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/23547174299.pdfIn PDF document text
    • 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_off0000d39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39C 10228 bytes
SHA-256: 4e8f02aa25f73b76d71200eb812abaf7542fa61039051a1773ba47d2143f4dcb
font_01_sfnt_off0000ea95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A7 20172 bytes
SHA-256: af039aea53a62bec13ecfba12d839b31b789b578e36db727751e6d2534c71ba5

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