Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5afb24531927825…

MALICIOUS

PDF

107.8 KB Created: 2021-08-26 07:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b1c85485459908835478422b5e4094f SHA-1: 6e7438523d491a9c98d8042b1d02e54596155319 SHA-256: a5afb245319278251c48b061bae0d2c2254cebd93c36a0a77a3c3c111a8abdb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to PDF files hosted on compromised websites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of multiple compromised CMS upload links and disposable hosting indicates a deliberate effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 http://kurier48.pl/files/userfiles/file/xerafezowezubi.pdf In PDF document text
    • http://srtprogetti.eu/userfiles/files/nerusokutesivanodugofu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6375453e9---bodabasakir.pdfIn PDF document text
    • http://ashioke.com/images/library/File/83216612296.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/maborobedu.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/39678976873.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/54027659497.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612432d9bdb28---31788427278.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/pexixebix.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/76431314536.pdfIn PDF document text
    • http://riversedgefm.com/files/file/natejugobuz.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/430318bcc1c5ffbd2fbe4c19ee3128d4/94924597066.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/wiwosipatamibeze.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/d5qqt4m7ea4p2h8jvu8rqcnvve/pidaxuv.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/65569041661.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/jetawukoli.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/lilegitawami.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/76221172892.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/13723575748.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/adr09c704dtgifk0tgrsr3a454/79802615679.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eaeef19ba0---fedajevomu.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202163529427899.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/14746582283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=upper+and+lower+case+gPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 62880 bytes
SHA-256: 58d6428006da296c77bc33b338ab8b2556394cad93b8206f5aa4c1d8db3df736
font_01_sfnt_off00015238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A4F 10592 bytes
SHA-256: 704807f50e69a9030df73664311c14bd0ff26be3f5405fc13a2c359b8903bf20
font_03_sfnt_off00018263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18263 2212 bytes
SHA-256: 8dfa7f38735820394166222f346eeeee9166293445a5e091a871cb95176de239
font_04_sfnt_off00018c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C3F 16076 bytes
SHA-256: 51ac9d4e17fc47509d4b6903cca2f2d2078ff28340c7fb655b9958ced8f54d9f

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