Malicious PDF — malware analysis report

Static analysis result for SHA-256 7155819d74da2b7c…

MALICIOUS

PDF

86.0 KB Created: 2021-07-04 07:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 56a876f6a3cf6577d31d246043fb8909 SHA-1: 44dc8f585e6ce4f916d79930b165c9f66f307cdf SHA-256: 7155819d74da2b7ccd97f9eef571a5037e391e9a7b8e39ee567c071b491cfb1d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to trick users into downloading further payloads.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d148427425632635bdf5ee669eafe241/namajurina.pdf
    • http://bidwoodmachine.com/d/files/sosubifokigetebipuwijedu.pdf
    • http://musorcentrum.hu/files/article/file/torodotopuwezixaniwugak.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/354ab9a194f529813a4463224e260238/komubekexavirilonizidawom.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fd311421d---juruwogejapagirukabaxifix.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c5822582358---gizipalusuwaruj.pdf
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/c7e6dcp6hsdsbtb0jelcmo0v9h/gogemulusowofir.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/1c84392bde2e87843e634b1d71eec0e0/rofosatinepilagexax.pdf
    • http://birnagarcollege.in/userfiles/file/23455023703.pdf
    • http://resetimpianti.it/reset/public/file/34790192611.pdf
    • http://gd-weimi.com/upfolder/e/files/20210702120343.pdf
    • http://jtour.vn/userfiles/file/fuvakurapawoxunafisapen.pdf
    • http://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/mafiromux.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/03b7d1ad09e427fbc069aa5b5fc82d41/farerex.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e3977b3f2---68399417040.pdf
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/a500a20c2f0b70207de984596b22b3af/xaludorit.pdf
    • http://nbpcpentecostalchurch.com/clients/65183/File/jekuwawisutusowosoka.pdf
    • https://steklo-shik.ru/userfiles/file/bijenavofasu.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3505bdd82f---20591258289.pdf
    • http://mientrungland.net/uploads/image/files/16668758597.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160844651375de---ronibilozetexed.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/9f1265ef587e2f87de8d7ebac55a346c/82818029574.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b56a67e79---76107994911.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850bd46e980---3916151007.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=nikki+griffin+fast+and+furious
    • 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_off0000effa.bin
9efe9027b570dfc84718367d5f05a08a8c856cadec8846d8f0708a3ec2a02c26
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFA 16524 bytes
font_01_sfnt_off00011b12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B12 16792 bytes
font_02_sfnt_off00013329.bin
cf7f7ee545094466486ae89652a5e4e46d6c928ee663cf8b3245f0b068b19f80
pdf-font-stream PDF embedded font (sfnt) at offset 0x13329 10520 bytes