Malicious PDF — malware analysis report

Static analysis result for SHA-256 96803a9758e99cbd…

MALICIOUS

PDF

95.5 KB Created: 2021-07-04 01:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 50b5104aa1e1d4a6ce67234dd6555de4 SHA-1: cae47d332c8672b0574457eb91f647644c5d0a8d SHA-256: 96803a9758e99cbd3d78067ad1f178864609ac914f9e37e4e50aeb3c14aa8556
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress sites, suggesting it functions as a link farm or redirection mechanism to phishing or malware distribution sites. The PDF structure and embedded URLs are consistent with a phishing attack aiming to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://laborke.ru/uplcv?utm_term=smallest+planet+in+the+universe
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eabc721e29---13473647205.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a7849a9d8ec585091694dfc43d8cc3f5/jikojejusolutubap.pdf
    • https://medosojewellery.com/userfiles/files/forabigokoxegavupa.pdf
    • http://bobiniauto.com/userfiles/file/sugigetexadoxu.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c92dbffa0e31efbceb5c66ff700e7ea7/90861799369.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dac500ab34---winetexenonap.pdf
    • http://fusen-es.info/yamituki-n/uploads/files/rodaregatubokuvuvexewuba.pdf
    • https://biocoils.com/img/file/50885901125.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5aaa39f33---zujurax.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be8b8153b43---27623295155.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/pbt74otnssc5ukdkifesv4pe66/wofowupinikepe.pdf
    • http://gidaero.com/upload/fckeditor/file/xosomores.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609460a8d48e0---51857922564.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096057ee7596---levesemak.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb55020c8---61452968558.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/8hjtiekin70341aida0jfhred0/16516175829.pdf
    • https://pt2-turbo-j3t.com/contents//files/lizudekoxoxawidere.pdf
    • http://ruoumoc.com/upload/files/75365472347.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/jibobalatolaw.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bca5d186c9---fidixelopekib.pdf
    • http://mwflower.com/upimagesfile///jonusow.pdf
    • http://lhsclassof68.com/clients/73441/File/94403579924.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fad2.bin
338cc954a946a7fbf70b29c55d5e66db99b2ef151e94d540d22e7b387f44db23
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 16232 bytes
font_01_sfnt_off000110b2.bin
b9b665d92f9b035bde10a6e0a96d675c2ce1fee65ccaa1abc81bf7a1518350f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 10640 bytes
font_02_sfnt_off000128d0.bin
dbd4f52b3d7cf1595f0b765e3b1dc6489d2a223a3d0be8a73f5dfb31f0123c1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x128D0 18048 bytes
font_03_sfnt_off00015838.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15838 16792 bytes