Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bd8556bc847c3a…

MALICIOUS

PDF

99.9 KB Created: 2021-06-30 03:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 427a605b87acacce49445fcfaa93792c SHA-1: 94111965c9740695818ab826ae5d76350046c697 SHA-256: 20bd8556bc847c3a4e1cdeb44c2b5fb2f0b79f3ca9a0d4aa22996cdb99c2566e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/30d50708eaea73693d59ef3830425f9e/48984483515.pdf In PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/teledejetoxamezaloja.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/16842083680.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/fea6231ac48a078cf925bf5731024398/87000529058.pdfIn PDF document text
    • http://turnyras.lt/Files/file/xosanedowidunozawexek.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b892b637937---takepenoxomakopupebava.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/katukufazinexavo.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/pakerunofalidare.pdfIn PDF document text
    • https://realschoolspirit.net/scauserfiles/files/fakiluxudaki.pdfIn PDF document text
    • https://service-panev.com/userfiles/xoxezuvitajibapev.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/19s91jui5m469msr7430ronvv7/82974582271.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849c4d9df4a---11012637862.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/3ebbf078d3a05584f5707a5f6e9ad2d6/45580839935.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/jologusos.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/umho0l3k4hgeasq02jf5lphvf1/lisawijomabuvonidovot.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/maniko.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/sigavosesi.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d842d51c41---31754398845.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210613153813_5sw8g7.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd1021d213---92819878095.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/fawepawesorarulixo.pdfIn PDF document text
    • http://ashioke.com/images/library/File/vemibeniw.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2ca9de880---vetivikedexekexobolup.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/fosodufogenevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=lab+report+for+vsepr+theory+and+shapes+of+molecules+answersPDF 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_off0001216d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216D 17632 bytes
SHA-256: 25777d734652eb96468a74bcc4157388882853c7c5b2923c4c0e9654a62d84f9
font_01_sfnt_off00014f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F83 11256 bytes
SHA-256: c3f3444c48f66dec0c0e2fae24cf16e6a731fc3a5b942c988a15b44daca796c9
font_02_sfnt_off0001699f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1699F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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