Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13fdaf18b216442…

MALICIOUS

PDF

71.8 KB Created: 2021-09-25 02:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0218b2ec6f29d558e03ec8b4564a7bec SHA-1: cf1db8929492589db9477abd7cd8084cb6dd9951 SHA-256: f13fdaf18b216442e9e4abb76ee4777e85e12a2625222d35b98734220f031750
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm or SEO poisoning attempt. ClamAV detected this as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The presence of embedded URLs suggests an attempt to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://krisoc.ru/uplcv?utm_term=structure+of+ovule+class+10 PDF link annotation
    • https://farsiherbal.com/cache/fck_files/file/xuvafumamazakod.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210907_121254.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/rofubisaxuba.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/bakidewunegisoti.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/pobotanoxarivaguvadiwa.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614161d1396e1---zawen.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/27287348309.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d64f3283f0---16535456704.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/suremubobojekaw.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161345baf3267f---jowarototisapefoni.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/81742491458.pdfIn PDF document text
    • https://coombs.gocascadia.com/images/cms/file/zoxuz.pdfIn PDF document text
    • https://esz.jp/img/editor/files/9333345732.pdfIn PDF document text
    • http://santeh.md/img/files/betasuril.pdfIn PDF document text
    • http://www.moyekolodin.com/files/83236332323.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/malexa.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/1185358704.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/77625557537.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/gunisu.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/judowi.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ejhljickgm18labkcs1mslasgf/23578239480.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f8fa9f1ee74277c1f0c79022b0dd069b/72816313179.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/bomukegoxevopugobudo.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/vixizenajusil.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/84001616421.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/silojodu.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/janutalekutolidoso.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_off0000b5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A8 16192 bytes
SHA-256: df01cad3ded0f31fbb8d57058afccbfc59ec46db17618c6c737eb36e34e24e2e
font_01_sfnt_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 10548 bytes
SHA-256: 37ff24ee1c7d7d3be1dc75d0c6cf48f8c9ef6528f3f090523beb069430af790c
font_02_sfnt_off0000f7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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