Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5942b7576c98c65…

MALICIOUS

PDF

87.1 KB Created: 2021-07-18 06:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 13520975e64ec27a4158b2ba86305c12 SHA-1: f01f5dd65f93a7c7264cace4365bc3be596d5314 SHA-256: e5942b7576c98c65b8a54f0718672f97d61e77e1cc82a58ae22b444a07f16bdc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://antifftech.com/uploadfile/file///2021050311490531.pdf In PDF document text
    • http://freeski.hu/freeski/file/xidoregol.pdfIn PDF document text
    • http://coffee33.ru/archive/file/vomemuwowozitibadixuju.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/81253901133.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/15097510868.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/32094423049.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/91185450490.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a847f263444---10349614223.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/suxupepezel.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/3mqvmu25n3nuo9avll775cj32n/duvurupetutowa.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608366b2d8c94---45806863669.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/d0an57s1jmhid57ibnp62d0hv2/65552727158.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/lurorupovig.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0b70846bb31fe906b1c391623b1aa386/145089213.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ab3e4327d---tetaso.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084f6508f733---29918376333.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/18dfda2ba36ce64e7e55dc54bfa80ac3/7030204136.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722f11847e0---vusenejerifezaxixoxedo.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb75be40bef---13066427686.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/82233508734.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/40705343274.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/rsa6ocbn41voh3csj3mpskggct/77999549842.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881611b844d---pixeko.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/zusomuxa.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/12581884696.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/12472703543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=powerball+estimated+jackpot+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_off0000ece0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE0 11136 bytes
SHA-256: 6a82d532fbfbd524ee11fa42c55130110949e2a3ff2164825b665d46082e9b59
font_01_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 18048 bytes
SHA-256: 08624bec7c28a1c7aa04f4b50bf17ab797e1129c2f4ee9416892cd528b9ab289
font_02_sfnt_off00013695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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