Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2148f9f83b872b…

MALICIOUS

PDF

103.9 KB Created: 2021-06-26 01:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6cd84a8fcb70e8f0caa6d2c677a6c59 SHA-1: f6d86a9cdd2e42cb1a10104c4eb0eff6e4f19c90 SHA-256: bf2148f9f83b872b9aba4460489874c11ecb0d1bed0040231f160ff88a4268ea
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

Heuristics 6

  • 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.
  • 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://studio45.live/wp-content/plugins/super-forms/uploads/php/files/mp2c08u5sks63vmegkprn64edi/kuset.pdf
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/suzilezulitisulevog.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985f14a087f---vovukakolimelijaw.pdf
    • https://capecoralliving.com/media/file/zosegagosusepavitepi.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/61e70f274e3b278cc8deb33fe646b7be/49049678697.pdf
    • http://rotang.net/userfiles/file/pojutisev.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/p63ub7a586nmakrg042vioddqp/gusilofedowetopuvapenop.pdf
    • http://kpotplace.com/uploads/files/bakudamofusumepojad.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609347baf2407---xugemizaxuvirezogaku.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/ec6d17bfe7be26169b522ff7e7844626/xivibelalafefuzaxexir.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607224ff1137b---kidokorov.pdf
    • https://zold-kommando.hu/files/9201412719.pdf
    • http://brenna-ski.pl/userfiles/file/dimefasikixufam.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/89763472681.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5944e7f1c5---54500008276.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f7bf901106615714926724d06c05203/38928560116.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6853b38d6---41288819656.pdf
    • https://hzautomatisering.nl/userfiles/file/29013072233.pdf
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/f4d13dd6148d8a8cae542264e84e5d1a/89707434419.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4b5b23516---14761143992.pdf
    • http://garderoba.sk/images/_file/39022306698.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/23ecbde03fa58d4f829669500c19d1a8/24588223338.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3oe12ahicilc200pknp0p81pd3/35076146455.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b9ed2214783112834bd5108d063475d8/8046871447.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a96c9bf49---82037560111.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160782a2a16d5b---fusezozujadajiwudaf.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=extended+major+scale+guitar
    • 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_off00013513.bin
0bf378d1424ee0146507a7db2f98967b2588ca64b32c33f391d8d3feeec6b632		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13513 16912 bytes
font_01_sfnt_off000160c7.bin
438b48e3334f2f58654df901629ff206033ac823184909eb583c1d0ad6a7a52f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160C7 11028 bytes
font_02_sfnt_off00017a34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A34 16792 bytes

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