Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3706fe7f203b26…

MALICIOUS

PDF

106.5 KB Created: 2021-06-25 22:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a2e1d7465b5d2a25ff62970e1d304cce SHA-1: ede917e205498cdc6cb052627f5c5cd722cedfb1 SHA-256: 6d3706fe7f203b26b93c5a2bcdae510413733696a0e651f7c01027fce3ba5211
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, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous links, including those on disposable hosting, suggests an attempt to obscure the true destination or distribute malicious content through a network of sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://musikpark-live.de/userfiles/file/6062210691.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lc2lgpav950s0p2ifku8nfvgg3/mesafa.pdfIn PDF document text
    • https://esz.jp/img/editor/files/82461821353.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098baf947e1d---woteloduda.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160793ba42db59---73258830854.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-22/20210622000559369229.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/38670167053.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/3b08039faaef65542ab72d4e6b9af646/4502423097.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a976ff19b9f---turefixi.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160849681b4704---50413936707.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/a8ad6fbc0b8a4959976ed07ed2dc270a/ropojidabiladerukole.pdfIn PDF document text
    • https://digireg.cn/upload/sumel.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c4be79e0841---nakafuwetamak.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/95062519436.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/da1936496ac5beaffcc6bec2a8d983b1/musemedosuviverav.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/95427068322.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/buwuguzedopo.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cc757a2a6---nudawit.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7857773d6---polaloziw.pdfIn PDF document text
    • https://retta-bg.com/userfiles/81381758705.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/638g5r7960bpnusa3td7i7s4bb/nolefowabeki.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4fe4e92e17f91cbf1959c7ffeb1fb7ef/xelemumisidefudutifig.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607feee17bca0---43671758558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=introduction+to+management+accounting+solutions+manualPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001551f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1551F 10764 bytes
SHA-256: 2e22d924f3527cfd5a176eafbf255e950317017caf2991f2ffbd857ec8cb3526
font_02_sfnt_off00016da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DA9 17744 bytes
SHA-256: ca1d305ec04ca7521563c68d4d0bf2a1bfaeebf1ce1c70e9cd1529a7f699ec50

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