Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0a7f735ac6f9d7…

MALICIOUS

PDF

85.6 KB Created: 2021-06-28 08:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ecb20a42fe5843ca4e9ff0f7a1eba25 SHA-1: 89b73b9676fa1db239d3898ca9dd87181ebe7e65 SHA-256: ff0a7f735ac6f9d7bd7eb1f0fa1fd87747705aa22b633bf0dc9ea6ed70cf82a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ivanamihic.com//files/33284690841.pdf
    • http://agnieszkapawlik.com/userfiles/file/gajejodovotetolopoxenabes.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795cb311c44---23957244604.pdf
    • http://donkaew-furniture.com/ckfinder/userfiles/files/kelejinetug.pdf
    • http://asbufestival.com/uploads/FCK_files/file/xugotugakosefesimibi.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/puturirunasupokimovumuveb.pdf
    • http://botosani.ro/img/uploads/file/lovanivoluxurupurumarawa.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc122036695---jilomisazugobaverumut.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d211b1b20d7bdd61e94d93a757cf7a7c/regovunab.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa53eae9520c974256cca8a0d8b333cb/9397029739.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dc4201c51---96012187137.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74379b4ee9---dugunaxezab.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607567b285ff9---ranuponakopuven.pdf
    • http://tunesistudio.eu/userfiles/files/jununupuvefuwifijamug.pdf
    • http://akcjonariusz.com/UserFiles/file/24592526873.pdf
    • https://szallas-karpatalja.com/upload/37736026109.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/84d8d944b5ac1345c029a2234e95d08d/56552965065.pdf
    • https://feng-shuiworld.com/userfiles/file/rofifuwi.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/5adfe421fc0a83931e1bf5ff927caf91/mutozokenadasazimototufu.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/jbf3spcu1484fckjlv9t6j7me7/nidudosi.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f999b40e5c---kogipejivutajus.pdf
    • https://vildmarksjagt.dk/userfiles/file/simidoseduvadugalatewana.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/61447df21c61a2846d4114a8e7b6a809/54353802520.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/b1ec36507257a2395fda86686ad2e780/85190045235.pdf
    • http://cnzgks.com/userfiles/file///dojamusovedij.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+make+chain+in+minecraft
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed4f.bin
fb1a5c8e56275992ccfddf21c37279e4233511f25842bc56c82ecee82f039a85
pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 10556 bytes
font_01_sfnt_off00010533.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10533 16792 bytes
font_02_sfnt_off00011d45.bin
4967183388cbaa8993950c27d1661a108eb7d7b1deeca1911d92cb62f51a1fdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D45 16908 bytes