Malicious PDF — malware analysis report

Static analysis result for SHA-256 0023d288ccdd6f36…

MALICIOUS

PDF

101.7 KB Created: 2021-08-17 21:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 674054ef0a874d849057808fb4427200 SHA-1: dfde87b39ac79c822c784d8e467c26521f7d061c SHA-256: 0023d288ccdd6f36f3b8376ece0e0344030caf0ee76d54f969e2f8129f9d8097
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'invoice' and 'download' lures further supports the phishing and malware distribution intent. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious content, likely a downloader or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=do+i+need+to+report+my+marriage+to+the+philippine+embassy PDF link annotation
    • http://popnmusic.fr/userfiles/file/dowimejibavibukavimure.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/18136235865.pdfIn PDF document text
    • http://fteq.ru/files/file/vulepaxixubalidenan.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/875ae286e59989eb49402034cfe713b0/44065221889.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/33597ca662cfdd8d1780930bb8b52e93/42208205771.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/gujusaru.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/79185483364.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/78320444177.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/fc1bd80fd98d5501c7e9b88dd6ec7d92/7686831872.pdfIn PDF document text
    • https://curvy.tw/upload/files/51395596145.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/28rc6o9q063gjv8t4kg73dadmv/nodinosovifaguwasixujog.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/farifaxagarokukofe.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/xerixufutexebegosiku.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078cbd50ea30---98090173173.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b28c9578f8a---49552379689.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/13252504222.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/nazimofizuweragutub.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/58288158659.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/uhdcu6336d87609v8m0uksldh4/vesamiwubel.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/68c1d66028f4f2b04b9d963d656f6aa8/javujumafigojutibas.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/nadakikatinurewagajuwaj.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/49827215276.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e94ae5e69d---14957408484.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_off00012715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2C 11092 bytes
SHA-256: 01fb9b24dc358238ef64229434936d393a26fae08dd6a68fcacfc2d3383d425e
font_02_sfnt_off0001585e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1585E 17516 bytes
SHA-256: 37eb6acc18f41637d018f4e1ca3b98cd02dc0112731a3a7c337721a5dffcd016

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