Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ac6b212cbc8e22…

MALICIOUS

PDF

82.3 KB Created: 2021-07-01 12:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae7a3b83550a3683ad6fbfd4f8c2cf35 SHA-1: 8e1c5ca3788255f3c8027f31537aa469cf5e57ed SHA-256: f0ac6b212cbc8e22d3f42f340f34756d2c0d72b51fe134ed954fa62ff7b8de31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload directories, suggesting a distribution mechanism for malicious content. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffb62db8d8---wajogeserawirojufar.pdf
    • https://living-stone.lu/userfiles/files/mibonis.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/q79u7ir1fo84udtidrrhe6j85b/4582042858.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d33775362d---bodalujatijagewulibopatu.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/r9n5g1la028mh7eji1romlcbvv/wepozalotumutukagomax.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/3lu7af50k04u75uq2s4sv93hm1/44488405867.pdf
    • http://onishi-kyosendo.jp/archive/koxovazukotajisomejuzodo.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bc7d9cf0e0401da42ac448db8bc2b7c6/bakuseg.pdf
    • http://ecohort.com/userfiles/files/69204765721.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/75913893511.pdf
    • http://cameralehiep.com/hinhanh_fckeditor/file/3879897198.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3890800013d7bbbe1bde892fb346f73a/dikulebumudax.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b0941277d---vonewuvako.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3f9352695---4276000688.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/gk907ltcodnf1pqpk2qlehlbk3/kurorugorekefegijev.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/de40836b09beed394ded8dc76e3029ea/fogasukugojaf.pdf
    • http://pincailight.com/zk/UploadFile/file/2021062219285373499.pdf
    • http://alexandrapanayotou.com/web/images/static/file/80378987415.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ao23n4sqojfugpij2j0nve260o/88759485843.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2aa61b1f---43276291289.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e21193184---potamonikufefe.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/48f22844d7fcafd711dbe651ee50e280/98377796884.pdf
    • http://vngo-cc.vn/cooker/public/files/24797492438.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/5da41a583e8628af62e301125635c5c4/xavofekudojogenurimus.pdf
    • https://muzeumkonstancina.pl/attachments/file/55019396310.pdf
    • https://louvre.lv/res/wysiwyg/file/93323192253.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=nioh+2+all+smithing+texts
    • 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_off0000dd54.bin
1d05b662f95c987ec25f611e4dad2d3e448cd6d939690e32a7ab150969c2765e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 16936 bytes
font_01_sfnt_off000109be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109BE 16792 bytes
font_02_sfnt_off000121d5.bin
c8b2cf46e7ecd6f1a69c746b887279bf57f2c4b470f310e4a4161b353b173f2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121D5 10656 bytes

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