Malicious PDF — malware analysis report

Static analysis result for SHA-256 77bf1f719d20e2a7…

MALICIOUS

PDF

87.4 KB Created: 2021-09-10 14:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 61283c209b9e54ec29d0f62100428b75 SHA-1: 649937192f3c07550300a07c5652c5e85cbfe6f3 SHA-256: 77bf1f719d20e2a77a8329635b485396e02e12cc794ccc112c4f1c403ff6c340
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=download+psp+roms+for+pc PDF link annotation
    • http://lachambredechos.com/userfiles/file/mamugiwamotemug.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613267c56e725---mijavavaze.pdfIn PDF document text
    • http://njchemland.com/upload/files/60494383899.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/35411548298.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/85931288986.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/71412157829.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/94358014839.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/merojinigugakumubek.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ert3p7e7brru29k0h2scnicih3/68868712305.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/22210891619.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/72028740212.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/97559304143.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/881rv3c0ru851mlmck73f284d0/rusokawezetujiti.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/40285019919.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109020350124308.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/5092755174.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/lakizumogozotataful.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/dnkk21i250u5opbrna77gnjrhm/tasidifelawin.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/47686613508.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/51182964883.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/35ba03lbju9i5n65nqdo095ak2/nivedi.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/70407198315.pdfIn PDF document text
    • http://charontrade.hu/data/file/65793490735.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/91338414251.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD581 18328 bytes
SHA-256: ce6377e7f9b16388787df6b990c31dac8bd41fe567d9f23398ab600a69150a1d
font_01_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 10544 bytes
SHA-256: 6597d6425e963baead2f24748ec33c6ce1e1ff447643ca4dbca44fd345bd64c7
font_02_sfnt_off00011d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001351e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351E 17560 bytes
SHA-256: 433367e852bbaf5cf76bf7a21cfca6361e80604936860ab3ac6c9401b9a9a049

Open this report in the interactive analyzer, or submit your own file for analysis.