Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c35fc39c6d72567…

MALICIOUS

PDF

77.4 KB Created: 2021-09-02 04:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e138ead831619638f48df3bd37854914 SHA-1: 45af681f056aff8ef5943fdaf073054b48891c68 SHA-256: 1c35fc39c6d7256791aebc4507c254171bdc266f769432386f86aff299dbd232
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The primary attack pattern involves tricking users into clicking these links, potentially leading to phishing pages or malware downloads.

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://nomylo.ru/uplcv?utm_term=square+feet+convert+to+linear+feet PDF link annotation
    • http://tpdw.pl/userfiles/file/22298663950.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cabbe8c578---rumabu.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/dekotomoz.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/60457447397.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/mupekevoganapugo.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/58527281275.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e60116ac51f---lelesasugaxogimowisino.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/lemejoduziwowa.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021052605142273499.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6e0a12a94---56792279308.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/45132213315.pdfIn PDF document text
    • https://castel.ro/userfiles/file/73701597344.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/70315577936.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/tusanazelamuwo.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/waxoxirofi.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/mevitupalelaf.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f1e3f8d7d8c---67644747624.pdfIn PDF document text
    • https://arendic.cl/files/29777694346.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/80956049881.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/47712056707.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608018d5891c8---71970344257.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/86c14b24ba6400aed4dbee28c1886653/jawusumojopimog.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111e1fb82c40---38815648544.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_off0000c969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC969 10548 bytes
SHA-256: 7fbd51882d046ccc94b754677c051c101b52776c089362dfa15e1a24b3b4b380
font_01_sfnt_off0000e1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B2 17740 bytes
SHA-256: 14ff8be72fd48e11b7d2fddc084386a729de99f3807ba6aa643630e9f5f1c7a6

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