Malicious PDF — malware analysis report

Static analysis result for SHA-256 4175433a21cbac2c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 05:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f28f53add09174583d816e4d6a07e5b5 SHA-1: d707083bb71dc5945b88b792ffe135f52de56363 SHA-256: 4175433a21cbac2cd15bba22bfec16dc409376dbf41c27723cd3fd692e3f8e5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the embedded URLs are the primary indicators of compromise, likely leading to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vitacanes.com/uploads/files/42209910642.pdf In PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf5b8b3a3---pivezexibunukufetavavadat.pdfIn PDF document text
    • https://starbox.fr/img/files/zofog.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/tavizefusekifotuv.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/16780588498.pdfIn PDF document text
    • https://educhina.mn/editor/files/59328980434.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/nidurirudoloxisukoxorule.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/34866552604.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/51798357120.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/fbd4a1babd49bf7a6dde7e117d54abc7/21929008840.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d6ba291e1---71462412752.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102df7f3c2a9---24695722446.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ncjqak1epo0cl74gs76bcavfj2/gagugajikegobibepizem.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/xepepugifujuzu.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a113d2305---93045285692.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/98447410549.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-14/20210814110246213108.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/40867020288.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/i3cv1kgccps8086v5ucrjqcror/36007534880.pdfIn PDF document text
    • http://df-foundry.net/d/files/43122512270.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41e83102ec---75760752756.pdfIn PDF document text
    • http://eqletstalk.com/uploads//files/202108130456151397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+house+train+a+catPDF 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_off0000e26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7C 17276 bytes
SHA-256: bb9ed301c0c682cb59bb9eff00ea6a52a713452495a587e7afb5f51500c884ad
font_02_sfnt_off00012713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12713 10456 bytes
SHA-256: 3283e337acc4434cf98e9c26f747e5d9d2c8a24cbdbacc54510d3cd11943c420

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