Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab03c33326ba6dd…

MALICIOUS

PDF

100.9 KB Created: 2021-07-07 20:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6db53ebe1402052d2826ddbc8531e556 SHA-1: fd812998b3a2ebc04251bd262f5cd908ef058ed6 SHA-256: 8ab03c33326ba6dda3ebfe099f9cbcec90418d2593b3389047fd2348d7a3e6fa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920db74fb54---98497966827.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160944b8b698cc---82876854050.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a375e0b4461---fifotimakukijuvobojoga.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/2k76d269dcloqvsnp6n72aq66j/89945401734.pdf
    • https://textolinguisticsolutions.com/upload/editor/file/foborojipasowatotola.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/962fdbf35040ba53ddda587d9408e1d7/vipugadiboluxetoxoluj.pdf
    • http://www.amedna.com/userfiles/files/96074277222.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8cb21b9728ddfd09f11cd34d4b1436ac/bumuzajak.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/fa1pg499q3af9fi7a1nligkfui/tikiwatixezukedoluwumo.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077395e3756a---vewipetupepujuweru.pdf
    • http://bluefield1966.com/clients/26642/File/manafasazoxopetepaleri.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/30e05bfca3d1670a46b072b2b508f6e2/16405666887.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160716bc1e537d---12663973012.pdf
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/34221496390.pdf
    • https://netshopnepal.com/userfiles/file/21750207554.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/036d98f64110d918cabb216c0cbb85da/xosupapegibexu.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/vnullqhtuc8dkcmc5i46rtp9e0/91535789017.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ddf930e8262768d5028530b7cbd4ea04/4877274129.pdf
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/89637780934.pdf
    • https://purefeeling8.com/data/file/wirosenofaxo.pdf
    • http://sam-global.ch/files/file/2355434172.pdf
    • https://energooptima.hu/upload/File/58297708475.pdf
    • http://moreit.ch/productinfo/file/mizurofitoxine.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+crucible+questions+act+1+answers
    • 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_off00012a48.bin
72caac6e9521fc00cefd4c196406f1f8a3dc766355ba1b7079d2513b7d14fad5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A48 10812 bytes
font_01_sfnt_off00014343.bin
e642357eff3263dac77a0e2d141f156dd0e83697f78a602c1e54c7ba64c4642c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14343 16628 bytes
font_02_sfnt_off00016e6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16E6C 16792 bytes