Malicious PDF — malware analysis report

Static analysis result for SHA-256 71769f775038a9c3…

MALICIOUS

PDF

73.6 KB Created: 2021-06-27 20:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 366507c273c3f91fe095438cbb8a996a SHA-1: e46ca5d48e756b5228821c7470b3b0b5545fe179 SHA-256: 71769f775038a9c3adf5bbd92f02bc48b551d8c7be0c7957c8c1c276013ca48c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mid-europe-ex.com/images/blog//file/19003169551.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c302b81a26d---xufafefun.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/384ecaa91e3b27a692bf44c7fbe27f93/25878615246.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8a72b0362411331861f95f199605b61/vogefekijesozodujesap.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607be7d7ad1ad---33947632859.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/fajamaligo.pdf
    • http://ztkammer.at/uploads/file/47395101356.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160849771e2068---11666513941.pdf
    • http://amphorabeautyclub.com/campannas/file/rubexiwoxotasapafibilir.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba84f521e14---49486188371.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/3847695dfee5ecb87bd39faa729a184f/xulawakawin.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160847c03264a7---99054194454.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/2562878e0b603692d9fb6bb043224a6f/86303615965.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa503dbcc29---17750667358.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/8842c1508c90f351777f374f588807d1/53044695555.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/487edabab70abe94f32e08807ea7e7a3/zarirugasagofukikon.pdf
    • https://imagebeaute.fr/userfiles/file/nusobobazutupoju.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a78e6bbc2---deradokefebejevapebafalu.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/55528268313.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ee8dd31eb4e63bd8d588538adef5a4e0/55927955473.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/27ea6fbdd087a7ed2371761494ae1a4e/womozo.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bc008f7eb---buduzepetujuledevulelu.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a9d0504d8---65774030131.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9963a8dd9---fawekomuw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+auto+detailers+near+me
    • 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_off0000c12b.bin
7ac15010b34e79c79b34666362457febcb0613e543a327e54739f5ab38a573f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC12B 15504 bytes
font_01_sfnt_off0000e8f2.bin
6def8011c6c3d065ae43c607d657a67b803f74823d15de0876ca437183e892c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 10560 bytes
font_02_sfnt_off00010101.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10101 16792 bytes

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