Malicious PDF — malware analysis report

Static analysis result for SHA-256 829a0c821b040018…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 23:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a39fb42869aa725d8132d2f33ede513d SHA-1: 153ef1d4166489ce5d144e1f15f7d502e813630b SHA-256: 829a0c821b0400182db6b44d596954a9eaf20e964fd623dd11eec31d8ee2bd6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://epoxidice.ro/mm/file/57436123159.pdf In PDF document text
    • http://vitanova-cattery.com/upload/file/gozuke.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/kilepupimaxasekade.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/75073398235.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/jijibokoduz.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/loxijerunur.pdfIn PDF document text
    • https://eniedu.com/data/file/20210901125224.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/befizenoja.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/67527975504.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/27463431121.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ecca72503dbd4b817141a3e7ae9a2e8e/kivukavatuwalofeni.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/21747012819.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/29457297503.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/tinudipopatifiwaju.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/8322129448.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613651e15767e---44233753181.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/82414907027.pdfIn PDF document text
    • http://webbuilders.com/files/file/21191581488.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/64081674524.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/gavujobijejisex.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/92027568438.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/llb8sr9nhk0odd598q0rq7blqt/22059810828.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/kufuvozi.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/79283586404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=moto+g7+android+versionPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/20199482408.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_off0000dafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFA 10484 bytes
SHA-256: 9e7e434ccd632716b1088f86e41cc5259cea5a6279a6bea392e3a5d5f1bf36f8
font_01_sfnt_off0000f2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE7 18776 bytes
SHA-256: 8b1a4c547f80f28ddddbd385f8f719208b3313252071cf35f662cdea5cb0defd