Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d86fe1b62881ce…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 09:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dd9f481d9f8e912764be5284ca48c60 SHA-1: d1f147fff171bdd5073f00769abac8ae2ecd58b5 SHA-256: 86d86fe1b62881cef50fc51f29f65ecaaa3010070d68ab575bfbe7324a17a103
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

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://cructi.ru/uplcv?utm_term=change+imei+rooted+android
    • https://fanaf.com/article_ressources/file/73910688634.pdf
    • https://aiwcecckolkata.org/FCKeditor/file/36403914134.pdf
    • https://undergroundtakeout.com/userfiles/file/83638375701.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/k1l5n7i1uuen2f33fuia69eg02/fupovesubomuj.pdf
    • http://cungcapbaoduongcuanhatban.com/upload/files/29518821557.pdf
    • https://naucharts.com/ckfinder/userfiles/files/17967648683.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/82006056891.pdf
    • https://fond.ru/userfiles/file/87059499653.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/49e7020904fd3875b8fe94d68653cf7e/dukafip.pdf
    • http://autosvilar.com/uploads/ckfinder/files/75079186128.pdf
    • https://takipbizde.com/calisma2/files/uploads/kiliwugibo.pdf
    • http://csc0516.com/userfiles/file/20210911075531_ltdz4a.pdf
    • https://organicfertilizerproduction.com/d/files/sedetunadalidavupubidakam.pdf
    • http://daugiavanthienphuoc.com/media/ftp/file/sakuxududegowurag.pdf
    • https://bauarch.bg/files/578608390.pdf
    • http://lsneotek.com/ckupload/files/47437659751.pdf
    • http://pol2-simf.ru/userfiles/file/95006637398.pdf
    • http://kirakuramenandsushi.com/uploads/files/14408328614.pdf
    • http://logicparcel.net/uploadsEditorfile/sisikeguzumalizozitano.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e46816b919---98551384581.pdf
    • http://chugguwang.com/files/fckeditor/file/44681869043.pdf
    • https://pragatitic.org/ckfinder/userfiles/files/69745574615.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1D 16792 bytes
font_01_sfnt_off0000c52f.bin
d5fd3332630135fb210119534817b3d21215812227e8129da82b370bac6fb9ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC52F 15800 bytes
font_02_sfnt_off0000ed68.bin
8653a0aa670ab68ae30a5ddc5dba38b307c95c40290faeedecc3a751cde634b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 10512 bytes

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