Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea929e20154896fb…

MALICIOUS

PDF

90.1 KB Created: 2021-10-07 01:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9cd3b519a6d4f5d78aa6f911ec89ee74 SHA-1: 290fcc8c9c28d42e1e19a5ed19940120fc827a47 SHA-256: ea929e20154896fb8cb6dc3bf31ad47f240ce574657f6cabb26c8ea7db33340b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate the PDF acts as a link farm, with multiple URLs pointing to potentially compromised CMS upload directories or disposable hosting. While no scripts were directly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://collinite.pl/userfiles/file/31328207963.pdf In PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a248793f9---tizizosote.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161574525309f7---13071888653.pdfIn PDF document text
    • https://buka.ru/sadm_files/kabagemobifofit.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/52236133667.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/tulaperimuxawafexeres.pdfIn PDF document text
    • http://vlajamo.cz/images/file/xuzozizufasijob.pdfIn PDF document text
    • http://praguetransfer.com/files/file/favemewupomiratobema.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/13766781848.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/88756934298.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/19521534137.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/52587635213.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/tapalujiwenudogupokevip.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/vetibeju.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/38795778389.pdfIn PDF document text
    • https://seerupit.dk/assens/file/26872055016.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/59582546441.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137a33a24237---tidepuvovilafuje.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/91863886241.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/vabewigubamilajipepo.pdfIn PDF document text
    • https://opremazabebe.me/userfiles/file/vojetowolijal.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/88339590436.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/razutubutofidop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=surnames+in+the+worldPDF link annotation
    • 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_off0000fbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 10772 bytes
SHA-256: d77d522b0ad51e2132fbc0d0308e39a694d3f0522d90f2fcb08d3097ab220a4e
font_01_sfnt_off0001144f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144F 17948 bytes
SHA-256: 43e9d8bf6a4baec37a97ad5f27107b1853bf2fc63d79ed2d2d200d131533db3e
font_02_sfnt_off0001428f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1