Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d25eae22ba0385…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 08:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cfd4d36f0811b76d0c2dd3335a805eda SHA-1: 282bc5f5bd8b79c6a9e033ad3659cec91fcf2446 SHA-256: 20d25eae22ba03854d538061671f6633dbe68d02a0a2fe0740a4882762f30602
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://tmkb.org.tr/ckfinder/userfiles/files/dajilajofit.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5b4e4e5b032516e1a9f2a72e9149f0d9/pasiw.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/gejamo.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a156235f2a7---temijurulugu.pdfIn PDF document text
    • http://terminsk.by/pics/files/jaxezuwize.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/2613561045.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/sotarukabosugujitusugabaz.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/funevejuluvebafezinisoxu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/adfd4332c23371293faf38349aa7cb60/86071433436.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/59621654692.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/56076453703.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611a08ee0f28f---24740868260.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb930d1d17---zebesujepulexina.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3v95rp3j2u7030cnrh7mfa1954/34898197326.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/31578032821.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/2a6012e2dffb343b4cf7ba874474ef54/vobonowowuwiwopafugaj.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/ponulexibab.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/47439560304.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/sinivit.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/59933806316.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e4af8a74b---68637403467.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/xodikekibov.pdfIn PDF document text
    • http://prosquash.by/data/fedibubosu.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096927880c6f---11122882400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=easy+word+search+kindergarten+pdfPDF 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_off0000d6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F0 17264 bytes
SHA-256: 4976614b82d8c2e399c5d02acccc102b02560076cdd4751898466fefa9fd2b45
font_01_sfnt_off00010400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10400 11128 bytes
SHA-256: 40223a64c404185dccdac9f2b5d5500cd68a2c146b56ee8f8616322bd58c2723
font_02_sfnt_off00011dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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