Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d68d10851180d5f…

MALICIOUS

PDF

89.9 KB Created: 2021-06-29 07:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90c340eefe096e0c625132502b54dbf3 SHA-1: d97264844dfa236f96d83465beebdd5fa235d1e8 SHA-256: 4d68d10851180d5f11621f02c86d73cfa7c1b439936e21b568782d32218fb807
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and is identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the structure and embedded URLs point towards a malicious workflow designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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.
  • 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 https://krisoc.ru/uplcv?utm_term=ppsspp+dragon+ball+z+shin+budokai+2+download+for+android
    • http://zartmobilia.com/userfiles/file/20210608050654.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075345547173---vorolezi.pdf
    • http://ashioke.com/images/library/File/xafesegutubitofa.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/a341101f940c9955027771a43bfa8b3f/todirimulatexezuruzofi.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f746eafb1---tixapuwimegudum.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160aba41b4e280---94196031753.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/fe251c446bc579385e46c7d2eee38961/panodadu.pdf
    • http://stauarchitetti.eu/userfiles/files/67862004554.pdf
    • http://bukvoznaika.ru/ckfinder/userfiles/files/96799960725.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c11f04d56---15790973792.pdf
    • https://dgssu.com/upfolder/e/files/20210627152258.pdf
    • http://anvlaw.com/userfiles/file/72129232045.pdf
    • https://arerp.kr/data/file///wetukapogoruko.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a59bf2cb89fe597075742dc281486250/83578394361.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b35f5570d---29873406385.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b98f296e050---radifog.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070adf8c4b15---merobu.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/b459336a2c09d0d800ab054f1fc49873/58664227917.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb0d05442---8600974334.pdf
    • http://woods-china.cn/ci2/userfiles/files/20210617175825.pdf
    • http://dahchen.tw/userfiles/file/wupajexokovi.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/losegogosote.pdf
    • https://maconlux.lu/userfiles/files/jusujatuzuwoduwari.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/xilinuremuzufogex.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/355d5fa0778f9d2399bda736296bd178/sazujekazi.pdf
    • http://musthighschool.mn/ckfinder/userfiles/files/75361174243.pdf
    • http://tksvolga.ru/userfiles/file/mebalogafibarudaxa.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0db18008456b77f9b96c58d1d776f934/41903980247.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f83e.bin
35c389bd5e60718ce6cd8be7a5324ad8a53ee7c1be8963d822235605dccc2960		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 17304 bytes
font_01_sfnt_off000125e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125E8 16792 bytes
font_02_sfnt_off00013dff.bin
231e8388175a329471d3ffaae3eee8cc719fb132f5c9d9dd05d3bf8ba7ba452f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFF 11144 bytes

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