Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f345617cb55082…

MALICIOUS

PDF

68.5 KB Created: 2021-09-07 14:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 35291d710ad77c7d932d63815c31878c SHA-1: 9601a91d2c7e723f5534dfa5992a2dd2038d52c1 SHA-256: 31f345617cb55082ab2422e7843f40fe1c8351ed6237a25e354f26cd679c0d4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links and the nature of the hosting indicate a phishing or SEO manipulation attack pattern.

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 https://uniqrelation.com/userfiles/file/zugarasilutusisumetumawit.pdf In PDF document text
    • https://askisan.com/upload/ckfinder/files/dazasiwar.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9e55ee0a6---89459935596.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e3fdc2a42b97c5d55b533603506831a2/38669771171.pdfIn PDF document text
    • https://masukpt1.com/contents//files/garefofiwufimatutaku.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/12644766406.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/76927179071.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/vetetoziwenabutelivu.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/lowuwomiz.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0e018c669---zelotasasarotigiwinow.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/3g3smmk3071263l752nv0hqn1e/tepezolubinukimepotunifo.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/47733704008.pdfIn PDF document text
    • http://brukbet.com/user_images/file/ludosuwanar.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/949e6531019fb3aefe721462541e3e29/lijaxisizokinilek.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/zisojevutazudoxoj.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/11444086789.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/08dcb15c6d8b587e00645d79249c8a87/55047582749.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16106efa9d01e9---95219033728.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210704075328.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608338be6a0d3---ziwituwedukojotis.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/66318690820.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/563a3ee5295cc33a2e9557a93d10266c/damizanologigumufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=motivasi+kerja+pdfPDF 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_off0000b107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB107 14140 bytes
SHA-256: aa6b2b4c3060d9d7436406cdb76e3da610998e66818f8072c636bd3b1fe69b14
font_01_sfnt_off0000d490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 10624 bytes
SHA-256: 9ba6928379ad64092275fe94449d01b3364ce93f55dcf0ffa137c0dbfed5178f

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