Malicious PDF — malware analysis report

Static analysis result for SHA-256 174c216ca309bf98…

MALICIOUS

PDF

84.5 KB Created: 2021-09-09 21:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 350a1c8312a72f14294eaa2315f22d19 SHA-1: a40d627ac9584ce55fa1cb59ec229be2d65bda15 SHA-256: 174c216ca309bf98a5cc355ba2f59c46c38912f015d1f666c87a7e7294df2776
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a link farm pointing to compromised WordPress uploads and disposable hosting domains, suggesting an attempt to distribute malicious content. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dydlhx.com/upfiles/file///94205345694.pdf In PDF document text
    • https://czus-lukasa.sk/userfiles/file/89186605720.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/luwugudemenidugixonaner.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/99317947174.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/tagiripazu.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/27342755333.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210908_EEDD95F4051F1711.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/35cc7d7b52523e3ef67845c7746e76dc/51980104615.pdfIn PDF document text
    • http://knipia.com/userfiles/file/66823903673.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613866b50db9d---sanifu.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/letewatenofamofubex.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/rotuvatujimonobadufezubob.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/91444067252.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109032315541587.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/72162479895.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/80040537627.pdfIn PDF document text
    • https://combrooncom.com/contents/files/32681861854.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/maxovizoxokami.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c880a28b6bb8f77f13ce35f14de46201/4331884169.pdfIn PDF document text
    • http://adice-area.com/pictures/files/92784050890.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/mugupivowapeb.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/rediwefilewawegozezal.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/gurupomegabarilejov.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/35123167802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pgn+viewer+androidPDF 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_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 18968 bytes
SHA-256: 006d6994c2f2420831f3d8d9f4898adff2f7b8cabe1344a878e6929bac77bd67
font_02_sfnt_off00012d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7A 10264 bytes
SHA-256: e2041b88becd7c40e03be406abd964a293c9db65f676695ef475dcc38bf3b93e

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