Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2258d946eb45760…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 13:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ac94ad3e15d468c99c0e9d0d1465692 SHA-1: 3b98e94212fac06d7cecbd326de82452fb9bc931 SHA-256: d2258d946eb45760abca6bd5c924b1e5772df9e15383036ab300d7554bdddb50
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nileagriculturalindustries.com/file/5497107639.pdf In PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/vozupubajejawiwuto.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/wurif.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/zomux.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/80289142101.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/kirofeto.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lodopusonilefokewo.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/wigume.pdfIn PDF document text
    • http://4darchitecture.org/img/all/24572052502.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/64578643598.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614766b02a77d---43493725051.pdfIn PDF document text
    • http://msiutilities.biz/documents/67349296154.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613698023e407---67785056725.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/lowiwevojerulufuk.pdfIn PDF document text
    • http://teakdeck.pl/files/file/lexeremesutufepumeras.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210913102826.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/56491427231.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/nizukagufufasonaxapogagaw.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/kkulhhsu6e51ao68tl0lib0i76/jodetewetubufurufopogukug.pdfIn PDF document text
    • https://bataretak.com/img/files/file/64985158325.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/43634854144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=multitrack+editor+androidPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/46377834601.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_off0000e45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45B 17792 bytes
SHA-256: 4f44c8e1c285ff1c2b3ac97fd036f2d23c7e31873ea610d180fb5015017bca0c
font_01_sfnt_off000111f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F9 10380 bytes
SHA-256: 6540639ddf59f947e88502248d43bd6b900c9e939f5b1dbcace40c2b65d2955e
font_02_sfnt_off00012990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1