Malicious PDF — malware analysis report

Static analysis result for SHA-256 336dfed9b9f2fc23…

MALICIOUS

PDF

105.0 KB Created: 2021-08-02 12:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 665a35e59d9a63e04b13eb4f47427573 SHA-1: 7458f3dc6bf4f2a653350bc08fc97c5af869cb28 SHA-256: 336dfed9b9f2fc23b85876262698df198321dc06946be196c7b06ddc15eacd15
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8e3f149d76e8961d1fbc8f2d73175628/47183353847.pdf In PDF document text
    • http://omgmediatank.com/userfiles/files/37897991242.pdfIn PDF document text
    • https://businesslife.com/content/file/75060905388.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210521134334_0xf6rg.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/5914454032.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/7c90b8cef2ec70dd63af7e7abf90c6ef/ribepezatikade.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/janifa.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a782d4ceb58---50178310048.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a451827e73a---1517632649.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/98658110193.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/33088587731.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/c5hlcr0j4mn05npo9nfcmmq278/88603739993.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccc04cea5c---952419447.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/62100883091.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/1772451970.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2669f3a48387bce1e84303ccc4f8f74d/17986733079.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/24874163261.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210727210607.pdfIn PDF document text
    • https://europartner2.pl/uploads/36651861329.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/90836580874.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/po1v9nkkdcp9e9h6ors74uh8hf/41382567551.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/71730253498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=high+probability+trading+marcel+link+pdf+drivePDF 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_off0001381f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381F 11304 bytes
SHA-256: 5a3dc397cb1cb66c08c7e68205c10156c8c2a0f2094d3e38ae131e9bb4d9aa70
font_01_sfnt_off00015208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A1A 17112 bytes
SHA-256: da4ed1dea79067063417a065dae1b8f652973cdb519e58441e5e2924f646122f