Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2990b7a7b55c516…

MALICIOUS

PDF

97.4 KB Created: 2021-06-26 17:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b669c03ee5bf98b48b8aa7da691dff7f SHA-1: 20a700a8d4bf6b8996405815ae1080ec089ccce9 SHA-256: c2990b7a7b55c516be991901285aec9a4268064880dca25703b93e7541aea50a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://derma-dts.de/files/file/geramabivojanabawotefaja.pdf
    • https://acrgroup.nl/userfiles/file/pekijomomos.pdf
    • https://hosvagyok.hu/userfiles/file/milagijopebunekavi.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/70veoj08t092i36lo9jlejsgge/bimepeguman.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/385b4b6901cf43630a48000596882004/53681006150.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/561ae7c3ade10340128e8d712a8adde5/79506648616.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6161768228---jepamofotewukesinufujoj.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606feb816d9e0---wisuju.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ed55144ad---gavox.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/10b3abcf71e3b9440a02879e599cf522/72499063521.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/40c979f919d07079f33dbe0671b79a82/zirowemarik.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607208bed3869---83560232354.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/9d4209967c24f0982d70d4bf63ce4c79/xawezomab.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a3401f45fd1---nabukezujufexapi.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080d88048204---14907254752.pdf
    • http://smartcevent.com/clients/871459/File/85071957333.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/sofedujisejofebomonobuk.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/85ee6e7e8208ef92b3a955272653ebd2/wojezerozozafofitivexa.pdf
    • http://flomojapan.com/upload/files/funofabufozej.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b248f1de964---94754078145.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f3094048178647e2b3134fceaa30d20c/fujewexe.pdf
    • http://web68s.com/upload/files/gegoziriwamabumalinu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a21740ac5a---werudexafopalutogexevodef.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6fde59274---wuvimeji.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b2a06aec2f32bd8a363330405c57a42e/dopuvedukujajuligopidel.pdf
    • http://dtcguild.org/clients/80367/File/vorituxijatulud.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0d4f6e3bb2be91c2bc14ac82b4b4b090/basefafejufuvipol.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+do+the+roles+of+detritivores+and+decomposers+differ+in+an+ecosystem
    • 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_off00011793.bin
20a69c2da9d6b904735c664500215463645b3010b48cb2e1dcd458d8922903d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11793 17668 bytes
font_01_sfnt_off0001453d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1453D 16792 bytes
font_02_sfnt_off00015d54.bin
379320e5cb3c1f12bb0f4dff52493bd81104854be983d03decddb5a290950e19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D54 11140 bytes

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