Malicious PDF — malware analysis report

Static analysis result for SHA-256 e604668ba432545b…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 09:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 575ab269d29b65ed96e4905f59c9a860 SHA-1: ba7fbb09ce071852ad2cb3ae769f0c8de1d9fd1c SHA-256: e604668ba432545b52791e81e67b1375316ad1a94f14e59ffee4258d220af39c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, including links to compromised WordPress uploads and disposable hosting, indicative of a link farm designed to redirect users. ClamAV and ML classifiers also flagged this PDF as malicious, suggesting it's part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mp2020.csysadmin.com/ckfinder/userfiles/files/nulilifojotu.pdf In PDF document text
    • http://belstroyiz.ru/img/file/videpapetiponotubosexemaz.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161452c9ce47f3---pigaduligibem.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/18486657970.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/43916245128.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/kopusepepatixufog.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/65459268601.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/43774795885.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210901075705_904477154.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/95087881903.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/lazevorova.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142f97ec2368---kasamaxuvajepe.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/52487478844.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613852118642f---72136434546.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/48948930396.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/14925518440.pdfIn PDF document text
    • http://industrialdevices.in/uploads/padananazovirisojobijunob.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/pemim.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210918063424.pdfIn PDF document text
    • http://rc-modeller.se/images/file///61369370525.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/53735856280.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631548637.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/5463938913.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/73268684435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+increase+mobile+internet+speedPDF 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_off0000bb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD379 15092 bytes
SHA-256: a168bb3eee009d90876173c1c8fd4b9feb34107698316af855dc033a73b31c89
font_02_sfnt_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 10892 bytes
SHA-256: a2691835dec3d1b77633879c8a3dd59efab2a946370272d1f263e2ca9ab418ab

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