Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b29bf7a08e5c868…

MALICIOUS

PDF

86.8 KB Created: 2021-09-08 06:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5bc7887071485c728494468042b49ab6 SHA-1: 0d8ee7de887f9664f668e67f0fc138cb61001746 SHA-256: 4b29bf7a08e5c868d1f7b6453e3dfb3251bb7e57cac3371c1b6c7456f1109b7d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external URIs pointing to potentially compromised websites and disposable hosting. The primary attack pattern involves directing users to these external links, which likely serve as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=flojet+5000+series+bottled+water+system+manual PDF link annotation
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a9150930e---gutiwifoban.pdfIn PDF document text
    • http://njnccualumni.com/clients/0/05/05b55d2c4c342460da0dc2f503861b12/File/vabofon.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/75322094094.pdfIn PDF document text
    • http://linza-market.ru/upload/files/10405454265.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6e53b23bc---18424272533.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/eo29n8puo32m165ct004q919is/32169350832.pdfIn PDF document text
    • http://teraval.cz/res/file/rajawurepuvenarigomej.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/98102864243.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/9099424331.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/sipadobevemijizur.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b18a00a275---46402148934.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2141bc92e---42178859682.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/28e3e61a4b45a120140cce97b92a737b/tatinuxeruresubajovuvaxi.pdfIn PDF document text
    • http://ccsl.asia/files/sifozuwixigigabo.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/63011991388.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dca1459be---58041171182.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fc8357c36---xexokugodupigap.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/botetojolelegexojaz.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/jagakogawopenegiwitifab.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/zezigugapowugaloxiwalemew.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/156b2f0a4a5160402e30223d005360b5/sufopi.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/11699584056.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/16ed1738f4525a71aed31bb73d82d2eb/dawifamefepujej.pdfIn PDF document text
    • https://labelmarket.pl/data/file/sofiroruxexikuvi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d50cdfb4e86---sitiketajava.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db7178844a---jawenupetikasa.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_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 11212 bytes
SHA-256: 694cb3ef50f576bccdc38a048dfa8e980dc89cd00f1a303f4fc1383bd1991022
font_02_sfnt_off00011f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F39 17824 bytes
SHA-256: 46a90c21351d3a37eb55fbe6f5bef6b0f660df3e340b207721a54ca7838887bb

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