Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d5a636012c8c28…

MALICIOUS

PDF

83.6 KB Created: 2021-08-20 10:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5d0f54d79f2c198c309d5ec454e4221 SHA-1: 225cb879f618a46feb322e3c1630659d26b64828 SHA-256: 86d5a636012c8c28c73456b10ea72b493f8153ac34e8716914e62bde3be8148c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics confirms the document's primary function is redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=nursing+pharmacology+made+incredibly+easy+pdf+free+download
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160801295354fa---50886678604.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/61tck52fdt0451kndmnjdma1n7/26638101191.pdf
    • https://sasalidayanisma.org/uploads/file/vifarulidozul.pdf
    • https://sportyou.fr/ckfinder/userfiles/files/wulejakabigudokizofafuge.pdf
    • http://alltechsro.cz/files/9959215005.pdf
    • http://amexeuro.com/an3_Uploads/file/43858938940.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609c505d82150---30374235319.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d180077765---99602314398.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f1c46eb86---81080410542.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1682cb627d---loleribiwikade.pdf
    • http://twtipa.com/upfile/files/2021/07/25/koditarubetafus.pdf
    • http://livingkaneohe.com/userimages/82224957278.pdf
    • http://el-system.jp/uploads/2012/files/pinur.pdf
    • http://ladyvenus.it/userfiles/files/kuwuzivisuvuzekon.pdf
    • https://actor-conseil.com/files/file/17773992836.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160badd9871bdc---wijenezalemif.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5f9305bf5---bemusexere.pdf
    • http://a-daily.jp/app/webroot/contents_img/files/galomijaro.pdf
    • https://agermag.ro/mm/file/kifakawetepapuzirubun.pdf
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/88931958941.pdf
    • https://bravo-hk.com/userfiles/file/xigakatomojeji.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4122d4704---80401937017.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842fb63f6c2---vegujuwojilokizubuji.pdf
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/25503256717.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/301dhbitbg68hct3rl6t5f0b2v/70411911182.pdf
    • 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_off0000dec8.bin
b42dd05adba20c72999973717b5330abfd22b976fe4485105fba167c1690d3a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC8 11388 bytes
font_01_sfnt_off0000f90d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 16792 bytes
font_02_sfnt_off0001111f.bin
24cba74bf8760a922a1ea0a7abd6c6214ce4e2fb1a05053b662531f8ac5ec2b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1111F 18024 bytes