Malicious PDF — malware analysis report

Static analysis result for SHA-256 015842677eb0890e…

MALICIOUS

PDF

75.0 KB Created: 2021-09-06 07:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7f0dde5789fde0f3f7fc187bab170f41 SHA-1: 537600a89cfb2c2e344e0505ead466a872ed8193 SHA-256: 015842677eb0890eb561883005ebc8415c0d167e36a78aac722d09643717e1c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=cpe+practice+tests+2+key+pdf PDF link annotation
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cc7fd99e26---6204095063.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/80941352368.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/8ad345cfcd53ddda4005caa74d3992f6/tebexerejivonezer.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ced0101ca3---razinokiwiwesinijobubumo.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/jonovufofe.pdfIn PDF document text
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/vejibenelelejomudup.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/212f26b6d16cc6aed7235ed30e7cdb40/jipax.pdfIn PDF document text
    • http://www.serenissimaservizi.com//files/tupuxew.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077904e9895e---52946116851.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/fojazunubugopakomowun.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/lopupe.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/fp346e79bf3lg99fl95lad1o1j/ginararevezexef.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/paof80qug81oihjf0gmb203rdg/983695604.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/829285673c3e9ba313a02781f29d5207/46366129179.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/43f2d0f02a9d38c0417f4e29c947017e/37339281656.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lnf6ridtpkpbsh9cph1jiaq6im/novowirupuzikidane.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7b5c5c966---51090187133.pdfIn PDF document text
    • http://darec.sk/files/files/wenazotezamijenixalidu.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/tapokeferefu.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/71322780332.pdfIn PDF document text
    • http://446888.top/userfiles/file/polovomifofilewuten.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/56c9ff52a766fcfcfbd464409d13f913/dirovekejowukej.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/9ce69963b9dcfb094018102b8fbbc81b/xuriworegiragizafubexema.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_off0000be3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3C 17932 bytes
SHA-256: e8f762d0c7a6fae2da8ca08ff1771fcc0a243fa81c65bf3d76ad4692aac82f0b
font_01_sfnt_off0000ed6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6A 10700 bytes
SHA-256: 3d863e1c45fe28a83f8d048fd0a98721149de1de79f693bb4c3b0dc0b649cf5e
font_02_sfnt_off00010641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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