Malicious PDF — malware analysis report

Static analysis result for SHA-256 830ef528e0cf1583…

MALICIOUS

PDF

84.8 KB Created: 2021-06-26 02:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ac7c5a92196ab4a28abfe51857a9a413 SHA-1: 441cf39b312086ac21aed6e79a979dc4913ae16f SHA-256: 830ef528e0cf158341ca67a29566ae27f3b87f42810d13bbb1774d7ed3eb99e1
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files hosted on various domains. The presence of these links suggests an attempt to lure users to malicious content, likely for phishing or to download further malware.

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 https://garglob.ru/uplcv?utm_term=natural+gas+energy PDF link annotation
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/1c91vn86rikpqter56r62birro/69222946753.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/d0d2435c711c2b1f528fa59930da3156/xafarezaden.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/e3ad3f277b80ed5b6bbcc4fc42597e8e/kulonidewojopa.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/19996113249.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160813d7c05510---ralam.pdfIn PDF document text
    • http://wamer.org/userfiles/file/11846698790.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ucf39cimh9fkivpfnssc449h3/fiduga.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801e7805f29---46854628555.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/b39847c0957111cdf12a557de1bcadf6/matazitamodaze.pdfIn PDF document text
    • http://omg.su/upload/File/10273920401.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/tepebijegobokomaxuxiwuxuw.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/zajexivojuveki.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/5f34b97d1c721debf7fcd661fda2ec8f/54280483098.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55ae1f0ec---dusoragovofokajuxadeguges.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a483f15154---zonibikasilitirekuravus.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a25821e04f0---rugexasojexusof.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c979f979684---matakelapinuzebusikajati.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf5257e8dd---22702563900.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c415a2cf87c360db0a792a8b745c9367/98430527316.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/26565073834.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/dagotidusazewusapezas.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/jafogedilifovodi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d326539920a---xufewixegofel.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/beberig.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 10260 bytes
SHA-256: 6b1e26729dca9b3b27ec18b92819e2bfadf93f2bf8c94123da30a3061166bb17
font_01_sfnt_off00010238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10238 16844 bytes
SHA-256: fc5de15f0efd62a8ba6cbc09f07d8d2277da978746c62cba120b583d4c624307
font_02_sfnt_off00012e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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