Malicious PDF — malware analysis report

Static analysis result for SHA-256 791998bfc7b7005d…

MALICIOUS

PDF

110.3 KB Created: 2021-08-15 20:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d5258f87750bb109c0e5927cd09c9143 SHA-1: cfb0c4f20cf5ba562938f4d3ac81254331abeb2f SHA-256: 791998bfc7b7005dd7b62929e36b214b9de15fb0142e898aa80db370454cf43e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm or distribution point for further malicious content. While no scripts were explicitly extracted, the nature of the URLs and the detection names suggest a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/jp2o5nvmro6lormc535ndue23m/lafafamiporelolegomazikix.pdf In PDF document text
    • https://bunyaminerdemir.com/resimler/files/sidiwinagef.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/58749852317.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/21165076917.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e13aa3aad709f9cab64149937483a067/42461068541.pdfIn PDF document text
    • http://sakra.sk/storage/file/7705758230.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/65134950267.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/javafukivofapolisumataba.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/64mmpskr50ikajqdjnv7eqp284/42827228628.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/690a693c13c06bc1bd3a487123ce53a8/dutusubebi.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/98283118326.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/eddfa0bf6c02be78b27abc8a5c35c7f9/wawivubulakemupevi.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873411357b5---mifabewebebujuneza.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2a6cbdad---52186885858.pdfIn PDF document text
    • https://advik.net/userfiles/file/sapijebobutamuvafulevop.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/zadiwukakovil.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2870ede6e3ef65ec1f8dfea3f17aaaa1/30629773336.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/48dba45ad3d1fe6681d7a676098f6805/raduf.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/8417cf10e24250076f936fc29809ba89/tegebomozuxuvuramavos.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/komizutoseworewanobo.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/4056bea9655f98138f5e8805829f6f48/53465367649.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/lajadutudegig.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/34336124263.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/rikunisipebijibopenodava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=is+pili+pascual+dating+anyonePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00018199.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18199 23392 bytes
SHA-256: 4a07451ea08c93c8038b9fdc4f9dd551f8cba9e9359ba73b29952fc087c32728
font_00_sfnt_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF501 10752 bytes
SHA-256: c47f5f6e737e6addd5faa521953769f7f2822f8e4b5f9b7f477e75a464030691
font_02_sfnt_off00010db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB3 21580 bytes
SHA-256: ce1788a6e78de0185e0fbf60e04c87ad9f4dbeb686cc6041f790f1d1812e070d
font_03_sfnt_off0001410d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1410D 21960 bytes
SHA-256: c7765c4c4e78f2668ee3c28cd6c62a6d0e7ab23ab9c774c717ae0dc4313bde04

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