Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c2188a14d821c17…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 08:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8cea6c5f7336f90ca05e84e4eb8ae92b SHA-1: 1e0acd70bbb65442dd1fe4b9c71f9d316e3cb11b SHA-256: 0c2188a14d821c17b612aded2cafeddf0f95aaacdbd05c2a64105d5dc91d9e42
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable domains. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights this behavior, suggesting an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://rjbmachinery.com/d/files/34871754457.pdf In PDF document text
    • https://dancleland.com/img/upload/file/53305852514.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/82038030ae1999847f40cfe0865c5fe0/38232951446.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/8ri93ru3qdof9l24sviqgdnahh/88091565355.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/fiduzidi.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/91053698819.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/88143419153.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d591d4908---wijukufuwuxegonamosekum.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/5105eb9a4451fbb2428539019c57cdb6/7883941913.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/buzeg.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630518397.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/razonilavimexelegunevajo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609279a4cdb53---13269733453.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/61642217099.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/jawinokata.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/nemitoxegolelofibuso.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/bibili.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f046fbafa5---65161320165.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/482011386.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/81425389846.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/rujoxefesajejite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=planning+under+pressure+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 17164 bytes
SHA-256: 6ad47b74d9be6f78493402eeb4154d1c7ca1c7b81dbab3561998a5d084d63f31
font_01_sfnt_off00010441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 10556 bytes
SHA-256: c547564abd6538ed062cf40f562cf03d9eb420cf48c1ac7686cc0b88f4f10dd9

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