Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae5d944896ef57a…

MALICIOUS

PDF

88.7 KB Created: 2021-08-01 13:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab9ebf5af0df650dc531662d7cb850f9 SHA-1: aafd8e6f855193158e10b8cf91ddf6a5a24f589b SHA-256: 9ae5d944896ef57a533f36e8972b6b813afbe3788519bb827df471cb18602e65
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, and the document body was unreadable, but the presence of many suspicious URLs strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://laborke.ru/uplcv?utm_term=fill+in+the+missing+numbers+1-20 PDF link annotation
    • http://sl-light.ru/design/img/upload/file/kipikapilidirasabemubada.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/48220359807.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/35f528c9cff79a6d88205a5d488ac314/41003469322.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/fetamizarowutoliredufana.pdfIn PDF document text
    • https://hirurgija.me//files/74573566092.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6826b9944f---1734218578.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722e80b197d---88247415002.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/8cf5228c8c42bd65305cb9279b31c6d9/kupiwu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/6cb831c2d2e30ba551c9b291dbaf6a5b/pixukisuwumo.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/0ba9356ecc4ae2dce2a2d141f82ed6ce/58301727665.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b17222f27d---74599859003.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/31157523777.pdfIn PDF document text
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/nepunixuwab.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/88253160662.pdfIn PDF document text
    • http://valeneighbors.com/userimages/bujaxovajipetogemixazuna.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/62711163255.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/lbd0q6mfmk6rs21j3qrlp2j5uo/94293154566.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/77784210221.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac985e5a8fe---85925621077.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/9530787838.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/luruneripi.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/59914321d994655d63382a02a78441b2/bedaponapusikuzaziluvu.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_off0000f36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 17792 bytes
SHA-256: 86e6104a54b34a7ca084d56261c305396a4edf868996484f30da4b3221578734
font_01_sfnt_off000121fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 10816 bytes
SHA-256: 30da6d6eea5d42b066fe974186c0ccae900fb233028052bd3792e6a0fcd45ce2
font_02_sfnt_off00013aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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