Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f9e1c3cda94531…

MALICIOUS

PDF

88.5 KB Created: 2021-07-06 02:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc32fae9db0c97b6639e9447f13b1201 SHA-1: 2562ce6fd7ffa9a4644e3155a636aa5d65c57053 SHA-256: 92f9e1c3cda9453147f3f3d1b78bc8b12b3e829bca9184e3dfa203dc3d29b3e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URLs point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865058b0a3b---70413123386.pdf
    • https://binarbaid.com/public_html/userfiles/file/vojirelijo.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160840cb68ab78---26745551528.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/388f150765f12686602ba463c43b813b/1863759088.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/1171291b100397e246374a9e8734bdee/gozuwova.pdf
    • http://asupuro.com/user_data/image//file/44190048395.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/24ef40c071a2ee071cb8206b095a4b23/tebapozajuno.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e253fcdf32b---46282993876.pdf
    • http://dmscsmartlifeblog.com/userfiles/files/42415693677.pdf
    • https://jamuiboe.com/webroot/upload_media/58950850973.pdf
    • http://cnhhgj.com/upfiles/userfiles/file/simaxawuparojumonegitul.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/157e8e21c0ed2c17e2a7caa6df37d660/sivijujodobegulaxabubo.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/2065927b77dc35b8dfe248e97d450c5a/65403842853.pdf
    • http://arohitourandtravels.com/userfiles/file/59450489182.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/3bf8edff37567870eea3eff80ba7bf3d/39799992913.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a89a663f3cf6dc04b7071883fe44560/4214322775.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/1eb3156fcd7afed7fe5122e7158a02e2/bijerewiwosesewesipokot.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/r2sk4pc2g9c0dpge1635jqbni6/29431918398.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/576aafdfbdec3874c87d0fe33acf6d02/gikarikamuxiwinume.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce82455c6bd---98227859603.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/43663332292.pdf
    • http://tipiland.net/upload/file/42568448902.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/38530123300.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8eae26747---14567249600.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mod+clash+of+clans+2021
    • 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_off0000f71c.bin
3f496695a25830a0830fc09a1842787e7cc3fe9adc6570a95cce8b9bdc6d8f3b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 18000 bytes
font_01_sfnt_off00012376.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12376 16792 bytes
font_02_sfnt_off00013b8d.bin
765227ef9e2e57a964251fa9b3198b8fe4146ba60d0f4d83ff8bcd36858656bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8D 10436 bytes