Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a63f2a12c01c20b…

MALICIOUS

PDF

82.7 KB Created: 2021-08-25 02:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 33b90c71a1a49ca7c7b23b3fab820b6a SHA-1: 461e97cb6b8ffd31c04d639e7fa4184907548be2 SHA-256: 7a63f2a12c01c20bf719b150d62fd6fa34259ca68e8299ca94a640093824ab73
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. The primary purpose appears to be directing users to potentially harmful external resources, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/c08f06583497609deaaa51e01e887d59/59229247958.pdf In PDF document text
    • http://efuegypt.org/userfiles/file/38630542606.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/rasosizujoxabufefu.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bebc7305c79ae59946017c758384b8cf/zuxexerijivuvamatag.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/63537323120.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae31f6bf648---jowolopupugirof.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/38008541054.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/477f647acdd29e10a50e00b057da5370/37499878521.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/42d91b60794c318378f24fd7731ff9d9/14157352463.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/pepipize.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c283bc33f4---9922623364.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/jabizubaroji.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/422a076256bec16dee6a93461c495b57/56995975213.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/77818348706.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/54910878624.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f0432f44c---tizilosadalute.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tanejokusozarugudut.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/wagedabudotazorunaxuvop.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210720_01B8F62957F926A0.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/ziratelo.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/oqbm32u5tpmcvodhojqa05s9s8/bifiburufaparuw.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/zagovax.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/4aed74a988d6e40fd599181394454f96/94927613853.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c564c298777---terojikivuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=possible+btts+matches+todayPDF 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_off0000e070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 10688 bytes
SHA-256: 99cef400550610fd0eff0bffa49f65e377e1f9eb7f1806c7f94c65cc4ae6902a
font_02_sfnt_off00011117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11117 17056 bytes
SHA-256: 2768a0271402bc35e973a7d689a3eba1e84486ad4e8d40877bbcff4640d87fd3

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