Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2db652753c852c5…

MALICIOUS

PDF

84.7 KB Created: 2021-06-26 10:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: efa636b504a879f1aeb04231d4358a1f SHA-1: f1b7691540068b762d6adba8d3a1ce4dd9c93631 SHA-256: f2db652753c852c5c6930f8249d9ed4bf5e17d2633682eb8e3844b11f365ba4b
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV heuristic strongly indicate maliciousness. The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/152d9387f36d263d83ac1ea29557d62d/duzomozaj.pdf
    • http://igabana.com/upfolder/e/files/20210602063841.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1c5e7c143a35ae1ce271e4f6f26d9ced/pafemivakowajodimurixa.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d82b8ed81c---gugedosafudelipobefed.pdf
    • http://short-story.ru/upload/file/resimesebapanuxud.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e6a66e0cec9e873e53bb3a5b82724875/90915220257.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd3a6e083---23614272691.pdf
    • http://bright-inter.com/file_media/file_image/file/71319110471.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d225b225af2---23722771692.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/h1l95tmvoft1tq9bvlv9iabprl/2231677269.pdf
    • https://watertorens.nl/userfiles/file/wejofi.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9c4f18b3c5b3829fc309435442f58825/11585515629.pdf
    • http://poiskvod.ru/images/file/nokumugagovivanadediguver.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/q1uufgm5dn3qeoq8dj867phv4p/mixoxetameduwuzus.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/cl43q61eont9rvnd0rk48rqr43/40575116187.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc9f5e80c5---zisivuletirawixakafel.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4985045fc---64149363742.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d347ddad04---panivimitas.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c281ae89921---24636583360.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606de2eb3b034---95763542596.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fffc72deb---gatovewejukapi.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b845ff1070e---guxagalaxaxubonosa.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ef70dc9f7ac9dff1bb8b820eee018ef3/gogitomasumuwigulu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=playing+bocce+ball+on+grass
    • 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_off0000eb77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB77 16792 bytes
font_01_sfnt_off00010389.bin
f9c14db4a21d64e4ff3f063ae55a870a106957cedad073004a98bc10453f6f12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 16364 bytes
font_02_sfnt_off00012dc5.bin
05a47de7a58a9dda87d0f15854273e4e15555eac2e258d9addc1f53e4d0a8718		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC5 10560 bytes

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