Malicious PDF — malware analysis report

Static analysis result for SHA-256 108399c917d61fbb…

MALICIOUS

PDF

74.1 KB Created: 2021-09-05 05:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a12434f51d9c11a442c51f47b2686502 SHA-1: 9c5df44d0a8ff632ef5c050979de690e0bb5634f SHA-256: 108399c917d61fbb7b6452df621359b6e79082b03797618bc9648fe5838e65e1
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to distribute malicious content. No scripts were extracted, but the structure and URL patterns indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074280cef584---59899384124.pdf In PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/malurewuje.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8a3888a7---xanebexeg.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/44140906696.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/vevajokobafuke.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/50592908245.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/gotevitigotixevagedug.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2594668ec783cf0f92086fa3463c6b91/bozugag.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/fd33e17d27cf9ce5cfe8ee41d21921fa/26389650274.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b6bec402---50749768526.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/83088255422.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210713035945091.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/lojud.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/45512742017.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8ccc0d43f---23466861601.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/35403815610.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/eb7fd9123851c8ac3627736dff5a2f22/xaromufobaluxudiw.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/70roodrlfq7l6h56tqau3j7o9f/tilejifamin.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/fesiretiriwadexi.pdfIn PDF document text
    • http://piecco.eu/upload/files/10840613129.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6fd9d4ecd---madugapurado.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/2376526798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=manual+plastificadora+naganoPDF 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_off0000bd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD69 17664 bytes
SHA-256: 981470eb4b747705f90a0b5a441828639b3bc269c3bd875baf2e1b5a24db94ef
font_01_sfnt_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 10756 bytes
SHA-256: f242fa811760c41151886732cfaeec7ffb1f667f5304a9fecec671532637bcf8

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