Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fca0748f9af502…

MALICIOUS

PDF

94.7 KB Created: 2021-08-29 07:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 2685b553d3d7932a8db1fa5141754c15 SHA-1: fd6c239006e176ec30cbb1cd7d68e9c9238377be SHA-256: b6fca0748f9af502b2eb507f816fefe8961ab274053edc9c064f3b44133b387c
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. It contains numerous embedded URLs that point to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these URLs and the overall structure indicate an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://queure.ru/uplcv?utm_term=physic+solutions+manual PDF link annotation
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97f3818e0a---joxigabobogonojexeginem.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/52937712292.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/14846207116.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/b1e992994910c2ebb76eff87f7a544e2/38530279680.pdfIn PDF document text
    • http://freewest.at/ditivezujafoximosawezuzo.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/6b407684731d408ceca69b745c8ebc1d/51459028942.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/55236789038.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/9203944795.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/38198282915.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/80816618578.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/90061051991.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6e0c1dc569fcefeca58259eabfda4415/42008357183.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/gaxefanebamezaveri.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc699202264---wikumesubukex.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-8-25/20210825050132101696.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/67951113117.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/62621980105.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a9c09214c---pajubadax.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daad280f99---77342560681.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/sj2861jj1k608mvv6agfkan8gp/sitolukadejixum.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610752a44a1c6---70765787545.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/gipox.pdfIn PDF document text
    • 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_off0001090b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 18976 bytes
SHA-256: 0a19acb93b9a3b4f48109869681b1d828d653ede97c217efade310e96f008c62
font_01_sfnt_off00013aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15301 10476 bytes
SHA-256: 43e6058eef1a9396d385c0425b600f6899d11ebc4abd382294fac15c237ba3db

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