Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9948cff5f75e170…

MALICIOUS

PDF

88.7 KB Created: 2021-07-05 16:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ac094949b9e4809dce59ccdded33f5e SHA-1: 59d59a07fe5286f7d2e93d6970e2319a950d4b33 SHA-256: f9948cff5f75e170aafc856a22defa7d77eb720eb8325be0286a1336c2ec5e9d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of multiple PDF files hosted on these sites, along with the ClamAV detection of 'Pdf.Phishing.Trojan', strongly indicates malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bc4a227b1---japeparek.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/8846c31e4838f2559bbbe5228e11b431/74198500698.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/271db7adf71db54d519c29faebada6ec/gezixudijaxixiz.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/6i8l0m0bq8rjkqj4cq0cmqksa5/41515520268.pdf
    • http://csc021.com/userfiles/file/20210625000252_s8gzxo.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dbf2aed99---4569603679.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abfa18e4aae---14735275603.pdf
    • https://oddluzanie.net/userfiles/file/13587503233.pdf
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/kukigavusodidobosurad.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/s37ngodhboobdkpi7sfchbebqi/fanusugetufugesivese.pdf
    • https://soechi.net/userfiles/file/gizeponez.pdf
    • https://acavacecio.it/userfiles/files/23303246767.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/35cd7939e29aaa71bc8d7cc1e9ad1b5e/68988167802.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/808a82a894a95bbf45ac23621acf6c00/nutol.pdf
    • https://habibitours.net/ckfinder/userfiles/files/81444434838.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083b92389623---sidegibunaxijizij.pdf
    • http://kondicionery-lubertsy.ru/upload_picture/file/mirorafodezirifoputet.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/t07uecntld6ok5rl9uqsffl82e/33102343376.pdf
    • http://ceramicaartisticamarsalese.it/userfiles/files/32945102821.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d268e11098a43460318f4fe0e6b3b4d1/32316244348.pdf
    • https://its-bulgaria.bg/files/file/bodumunaba.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074139e1b5ee---29530991429.pdf
    • https://noithatkuongthinh.com/uploads/files/gitamuwadipagerubepi.pdf
    • https://realschoolspirit.net/scauserfiles/files/31671571861.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=non+chronological+report+on+tigers
    • 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_off0000f810.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF810 16792 bytes
font_01_sfnt_off00011022.bin
e658936c58ae78caf15a57c4bb716f87aa7af0ffa459db281a3979c5ec722dd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11022 17396 bytes
font_02_sfnt_off00013d73.bin
bca82fb92bbd665322cb2ded6ff5d49bc1ced17ba55909ad893647b480e25b84
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D73 10632 bytes