Malicious PDF — malware analysis report

Static analysis result for SHA-256 321ac394346e3a4b…

MALICIOUS

PDF

78.8 KB Created: 2021-06-25 19:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1cfa8beaecf1419404b542c1481018a8 SHA-1: 186d0c4a24ce237eae1e2a3253eca9ed82360c12 SHA-256: 321ac394346e3a4b45d51887cd474f2f4c084d5f0ea3ae97fc507420ffab2338
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall detection indicate an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://philabc.ru/uplcv?utm_term=download+any+video+from+any+site+online PDF link annotation
    • http://akademia-jedenastka.pl/zdjecia/fck/file/51672512336.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/24345cc897551ecf5c1972b343edc030/kodemifamitu.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba39fc333a---20735290492.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/40973388530.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/75601438473.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/1cbe2a097732ab2775ab96cbab36b957/21759201195.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2dad6b9cf---gazonabenofefo.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4fd6f1d7c---depexisagugogunozuj.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/bemov.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/90592951300.pdfIn PDF document text
    • https://luminex.pl/upload/file/70363908427.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/qds85881st0ttin69frjjv690h/sovabebonipoguwijodawesat.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/16509451725.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/30363050319.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c65db59ccb0---zesoras.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/zixapivizapekovobimivuxo.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/hom2hbu5j9hki9seu5u1f34p9a/zuluvazopabiweridewepopu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fgbv3757aa0jk2e5k8sqekqqu4/jexuz.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a225705e202---fuzixoluwolez.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/109201268c47443a319c73a41ad3e166/fodefobavepazuli.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/sawasejuwigukamoze.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/613b58550ac48888e941c3cef5e4a304/puxisi.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/166i4g5ouqh94unufb0q7dsmp5/tizavagamafuxokirunexuxaw.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/sulebajipapigimirogebatog.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/aver641ipgluu1fn95cstr6778/nagumalozegimubexufuk.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_off0000d1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C3 10784 bytes
SHA-256: 2ddc7ad06859e1141a590e14bab93e8983bb84bfd48f1267357efe88468fce06
font_01_sfnt_off0000eaa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA2 16552 bytes
SHA-256: 6958300148284c4d3753ff6addd15ad954a7d47e6bf5164bd251a6347a53e3aa
font_02_sfnt_off00011565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11565 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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