Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff55dfacabf80a2…

MALICIOUS

PDF

69.9 KB Created: 2021-09-15 14:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab3f81cadfbf709e9263957b1d0e7102 SHA-1: 1a3cde0bf6daef342a4a1bda3142d9850710cf1b SHA-256: 6ff55dfacabf80a27ba24048505c205230184a115db98ded34e30fb46935afb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous external URIs, many hosted on disposable domains or compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs point to a common tactic of redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://ketchas.ru/uplcv?utm_term=best+repost+app+for+instagram+2020+android
    • https://n-tlg.com/files/file/towesonumetepafizi.pdf
    • http://myxroad.net/upload/userfiles/file///26074306326.pdf
    • http://systempro.kr/userData/board/file/86708068345.pdf
    • http://tdsns.ru/userfiles/file/mojexijabazawewabiguz.pdf
    • http://uelzecht.lu/userfiles/files/jonamaketemonano.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f4b445510a05e0d4cb94af7f3b02390a/27381319552.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363ac436054---15361367447.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/3cc3f2e0139447249d8419d187164b60/bodeludujive.pdf
    • http://angelofthewinds.net/ckfinder/userfiles/files/xogevejofivuko.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c68a386d82---36722264305.pdf
    • http://szyqjsj.com/UploadFile/file/20210908222210529.pdf
    • http://aimic.com/userfiles/file/95364087869.pdf
    • http://hantechwelding.com/userfiles/file/2021090715553173499.pdf
    • http://kingtonkatsu.com/uploads/files/wusunumagimoru.pdf
    • https://xanbiente.de/userfiles/file/tivekipunisojagekuba.pdf
    • http://plise.org/userfiles/file/mobowipidakotuwiguj.pdf
    • http://alkanboya.com/files/file///35583041056.pdf
    • http://joyear.com/ckfinder/userfiles/files/17235236487.pdf
    • http://sdsenlex.com/upload/files/vabitunujikuturepazi.pdf
    • http://lingeriedediva.com/UploadFile/file/2021091409482773499.pdf
    • https://mekongtransport.com/upload/userfiles/files/jigokuritapesopifalovive.pdf
    • https://hosvagyok.hu/userfiles/file/23089137052.pdf
    • http://pwmtqatar.net/userfiles/file/51725165502.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/29047139223.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_off0000b2e0.bin
7eb90e3e6707cf58e88d6e51a248cbe80d75c339f6a848717c6992a42a874faa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E0 11092 bytes
font_01_sfnt_off0000cc8d.bin
f502127d6ca1c5137d55e4e035469867b637db91436fc3fca23897947d5092b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8D 14604 bytes
font_02_sfnt_off0000f127.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 16792 bytes

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