Malicious PDF — malware analysis report

Static analysis result for SHA-256 e618d4f4cbd31c73…

MALICIOUS

PDF

75.3 KB Created: 2021-09-20 01:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9134f554c073e9048671a305115472d SHA-1: 3c334a7eef24f7fe3ca02eafd6f5b4a7f50c968c SHA-256: e618d4f4cbd31c73cc45edd91020104d77f3abc499681997ac50349e51c25dc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to potentially malicious PDF files hosted on compromised WordPress sites and disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a deliberate effort to obscure the true destination or host the content on low-reputation infrastructure.

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 https://coretry.ru/uplcv?utm_term=fb+lite+old+apk
    • http://sangjeom.com/userfiles/file///97167302933.pdf
    • http://thoitrangvabaoho.com/Images_upload/files/38926013542.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/98b94056e3df40bfbf567865ac975d53/83538559890.pdf
    • http://feuerwehr-mittenwalde.de/mediathek/files/gunorutavafutavevinaraku.pdf
    • http://chongqinghaohong.com/upload/files/15874128193.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a378474f02---fabozujakozoxesawonasino.pdf
    • https://textolinguisticsolutions.com/upload/editor/file/zuforexefosu.pdf
    • http://thuexe7cho.vn/upload/files/tupitutetisojelolido.pdf
    • https://demetraproject.eu/ckfinder/userfiles/files/74197599527.pdf
    • http://lacasedescaraibes.fr/file/xuniguluzenefawaw.pdf
    • http://handsonmontessoripk.com/userfiles/files/42115709850.pdf
    • https://kopari.hu/files/file/44457910948.pdf
    • http://selmanoglusigorta.com/userfiles/file/numifedotogivuxejub.pdf
    • http://windowsplusllc.com/ckfinder/userfiles/files/jojefojuguvimupimo.pdf
    • https://tekmaker.com/upload/files/vopitumuzesatijasikomojot.pdf
    • https://aromamarketing.md/img/files/12942260207.pdf
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zezimekasiwerabuge.pdf
    • http://cmtsport.com/pliki/pudojapejapijosu.pdf
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/95588229859.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/74cb68a200fb8d5afa1467929bbfa589/72267929103.pdf
    • http://box8websites.com/ckfinder/userfiles/files/16269795863.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_off0000c5f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F2 16792 bytes
font_01_sfnt_off0000de09.bin
6f4552d1ccc74d0cde56bed9477a691303ddf41287d345520a832b807be5fa61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE09 10220 bytes
font_02_sfnt_off0000f4cc.bin
9e6eba7be9533c46d40c1ff6156d2e6808be3edc9e2bdbb937a2bf7796ea418e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 16840 bytes

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