Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe5b5346796ebca…

MALICIOUS

PDF

68.8 KB Created: 2021-08-31 11:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1aa127cde248e74cb2a46fefd2cdb637 SHA-1: 95872f6bec7d0fcc9e58d6528bd641c8252de6dc SHA-256: 5fe5b5346796ebcadd325e275f8c856f5b934793cd1afddb91d13d5b80fae08a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other domains, likely intended to lure users to malicious sites. The presence of many distinct hosts and the use of 'utm_term' parameters suggest a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e77161f4544f512f673701b06cfbb4d7/loseduduzewutakikivuganor.pdf In PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/guxemanuvuguxowilejezilu.pdfIn PDF document text
    • https://tch.lu/files/files/pijaguxiruziliwu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a2f31ff6c---sorolut.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/4orr2n9atm7e9roea1lp22qg60/15519843949.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/35865822344.pdfIn PDF document text
    • http://yongqingtech.com/d/files/4781328227.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d38c8a5328---fijukuvuwexoxo.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202183102014049.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/40993444839.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b956d79f0c---ranude.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/gikekogufoxap.pdfIn PDF document text
    • http://artospace.com/pics/file/sodifevis.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/53d1f597e0758bd73eeb44be906e3032/15096230350.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/tinibeniwuxesut.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099233ea3111---38950394029.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/budo412i7vrr4kldfndbrtbema/23276298752.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/jivoxorivedibowekenulik.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/28728398062.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/zariwonotef.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/91475842330.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/837ss8dfioa3st0m4e6nsj37nd/balipu.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/91837399446.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/zegokefavofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=past+simple+knockPDF 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_off0000b1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F3 10528 bytes
SHA-256: d90c9de160cd9f2a2c9dbfd91b6473b71b578b2970598d1184796f6b92cbfe32
font_01_sfnt_off0000c9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FD 14500 bytes
SHA-256: 153271c6645345cb11ab1e2fbb172b77e004dc65079cd6af13da6efe9683c388

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