Malicious PDF — malware analysis report

Static analysis result for SHA-256 317fecb901741746…

MALICIOUS

PDF

84.7 KB Created: 2021-08-15 17:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d7c106442494688c3cb117c6335fadb9 SHA-1: 909f12312d420258776c9e046287238729053fb5 SHA-256: 317fecb9017417463ea7c1eab98f0bb73612f26114e50a854370c4433dc1ce6c
236 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm and employs social engineering tactics, specifically a 'ClickFix' lure, instructing the user to press Win+R or paste commands into a terminal. This strongly suggests the document is designed to bypass macro restrictions and trick the user into executing a malicious command, likely to download and run a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/466c023ab6ebf138ca967570dd909ea9/namesegapogafumubolol.pdf In PDF document text
    • http://pillshop.ru/uimg/files/bitagubapi.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/87070099585.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3ph2vi9rqlt3a2coohi2il7gmb/37956328238.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/c0spjshms4umdj8l1k0md4kavn/mepafezilani.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/63619173951.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/zewuzadirumego.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/91137301286.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/pazileromekefowi.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/12756943563.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/8f6b58a1bbfe8dd8c2af0ba4f951a419/bezapomanonusunomorifek.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/duderutopiwopoj.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/sufodeza.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/86578713210.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768de2c6435---wavijofimewoferuze.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/radudujaz.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/81262007475.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/71962630737.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e19412b5a1---vuwudisalexunowe.pdfIn PDF document text
    • http://grupophi.es/uploads/files/budin.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/5667200922.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1577a3db18---dimatikuvogojosapotexubok.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe85a26341---demenip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+are+all+the+commands+in+command+promptPDF link annotation
    • 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_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 18188 bytes
SHA-256: 86e6390f8dd694daaec6c0825d6f36f02fc46e83df9ab91561e546e4698aea5e
font_01_sfnt_off000112f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0B 10772 bytes
SHA-256: f43a4622823b11a524023a0fb5092e9cccdcf46d1bdd457ef200fa02f2fea538

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