Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f1c75a5f3f8a75…

MALICIOUS

PDF

92.6 KB Created: 2021-06-27 01:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91c1c6a88f738f69faed5a116d8c0e79 SHA-1: 4b03cff621ce23173f398e3d583ebde35a43c822 SHA-256: 97f1c75a5f3f8a75e3625b74b063125c9d0ca59e4a340111fcc0714a8b1f8346
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://catamma.ru/uplcv?utm_term=meaning+of+chin+chin
    • http://ankamet.com/userfiles/file/nadejutonum.pdf
    • http://etnorom.hu/pictures/69441370796.pdf
    • http://proxima-design.cz/files/file/wiwikatoperomuwu.pdf
    • http://akkoryazilim.com/userfiles/file/92657265721.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/h8m2g1r08uqo8u8rq7a3a4aidg/wimonezevaseruwi.pdf
    • https://cordovajewelry.com/images/file/38286429662.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/kibuzipalodosifumukiwade.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160d02a6f47106---58096194939.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcb7e0dc49---37716753246.pdf
    • https://weddingitaly.jp/images/file/31811006266.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/i9m6pnlmhkk98affaol2djd5n0/53547425058.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/109923fa24504a2edec37a038515a85a/pilokog.pdf
    • http://driver-jazda.pl/upload/file/vodalekukowojugog.pdf
    • http://andlupa.com/userfiles/file/jasetavuwovodeve.pdf
    • http://kengosushionlineorder.com/uploads/files/84457606962.pdf
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/kaxeroferutalaluwobedizu.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/fbbad20400008c720c09966bb53e6613/79049457827.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8e89b8d130dd0b07251da2c3792a24cb/74823737844.pdf
    • https://aronabritcan.com/userfiles/file/32334688302.pdf
    • https://zlatartopalovic.rs//files/xizeluwuvoze.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160904966b3773---boraduzekalopiritetub.pdf
    • http://aloeverajuice.cz/files/file/vixinepojisukiwapupadezut.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9fb6d58e9---33495142249.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 16792 bytes
font_01_sfnt_off00011335.bin
b627c5c60ee4a7d2dbc2f153574d5218131bc133010e6ce61a050f1760b17fd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11335 10196 bytes
font_02_sfnt_off000129ef.bin
c52f36dff1b03d7657e044c0fa8788f6c458332026d468fb879ee64f7be9d9e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x129EF 1888 bytes
font_03_sfnt_off00013286.bin
7e8f1ab4ed6f491e56b86ef15bd9cf6f889f81ad929b5b6a76fdd49c213f5d9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13286 19164 bytes