Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f87e8d683140d3…

MALICIOUS

PDF

110.7 KB Created: 2021-07-08 16:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb601ed9169d2b60c54470632ad756a5 SHA-1: 2104d1fb57b2100854f7baa67f7e0771f98361f9 SHA-256: e8f87e8d683140d3649aa1ca87168ac932efd5eab6c05fad99d17ee39946b512
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to compromised WordPress sites and other suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of 'LOLBin token sequence' suggests an attempt to disguise execution commands within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://laborke.ru/uplcv?utm_term=witcher+3+money+cheat+ps4
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/tro447qaem5fk0phnrl6p4i130/27103613907.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a095fa24339---34427080385.pdf
    • https://vresponse.net/userfiles/file/pixevovitepuvujitupuzog.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bd0e6ec7f---66893423540.pdf
    • http://hnht-electromagnet.com/d/files/6840340886.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/jvm2kappunmh97fsi1k6ca5u07/61291855191.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/74379904933.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/219be9f147428dd21fc4e1ae336affe1/rubawikatarusa.pdf
    • https://tvmreza.tv/ckfinder/userfiles/files/45034066271.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093afb9a8c65---8808077978.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c89a0c8859f8e85582f1ad6d1873ffcb/netafogosajogegatisajaxu.pdf
    • https://grupo-kayros.com/userfiles/file/fuwekomamamuki.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c64c65fe0---pasiziz.pdf
    • https://vaitinhdien.com/app/webroot/upload/files/84988987095.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/36367ef0cd3bc414e3279e86589b6949/fotisavofu.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf623a9d75---vamixewejejimome.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/7l8cmd3t2d9ujg4ndf1vf3mjkm/52500408704.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6f855b69d99150da89578c691cfd1594/46554149264.pdf
    • https://laps.pl/userfiles/file/lukijo.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c77f0020---73144228303.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38f5f9ace4---luxoratomikibewidewatozab.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160967610c931e---44549067868.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/c652acc1e4d725cd115029cbf5bd712e/43845367565.pdf
    • https://rajaketiga.com/contents//files/tomuzurivesukekota.pdf
    • http://reversetheclocknow.com/ckfinder/userfiles/files/96989234560.pdf
    • https://advancedbusi
    • 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_off00014c17.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C17 16792 bytes
font_01_sfnt_off0001642e.bin
99db8c58c48333e700b1846dc84e93b954c2ab153786c97d332a4176e1b1023c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1642E 10952 bytes
font_02_sfnt_off00017d85.bin
8e6bc28f5a9c8aee6dc1c9bba6075235b818bb097d4f8c4910fe58d332ac2556
pdf-font-stream PDF embedded font (sfnt) at offset 0x17D85 18180 bytes