Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bc55557128d660…

MALICIOUS

PDF

69.3 KB Created: 2021-09-16 21:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccc56368882efc40710182c121412f73 SHA-1: ace533c10f2c1e82373f4fea1daf449082dba6b2 SHA-256: a1bc55557128d660aa3a45703d15c2bdf68d0d6713b53ec544f0834662e446f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farm heuristics, indicating a primary purpose of redirecting users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=free+rebel+flag+wallpaper+for+android
    • http://vikohasanfiber.com/upload/files/tanifamemexi.pdf
    • http://sten.kr/club/data/userfiles/file/20210916192134.pdf
    • http://www.museopizarra.com/ckfinder/userfiles/files/87556591852.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/hc12sus67v6g4v94o7ugtk47kt/14390429274.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140948526fb9---mabusisufarufi.pdf
    • http://0-50.ru/userfiles/file/84029645631.pdf
    • http://materialdeestudo.top/userfiles/files/gikid.pdf
    • http://bloodfaces.de/attachment/file/28439407683.pdf
    • https://ntiverification.com/userfiles/file/19976708529.pdf
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/lolenur.pdf
    • http://rracc.com/file_media/file_image/file/gudegenuzimumom.pdf
    • https://zenithoverseas.com/assets/userfiles/files/53790839163.pdf
    • http://jafra-com.at/userfiles/file/dibexifubumesobafuk.pdf
    • http://sarljarry.com/userfiles/file/9623777249.pdf
    • http://tmacfashion.com/ckfinder/userfiles/files/niledixalulolaxiniganonuv.pdf
    • https://clubelsendero.com/img_pag/file/96281968422.pdf
    • http://urdu-hadith.com/survey/userfiles/files/6869755862.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143154356aa5---tovan.pdf
    • http://adhunikjewellers.com/ckfinder/userfiles/files/81726980790.pdf
    • https://fizjolech.pl/userfiles/file/65729958371.pdf
    • https://kaparatt.com/images/File/40392726275.pdf
    • https://benhgout.net/uploads/Files/file/jusodiwepiminopate.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_off0000ad1a.bin
1b41a331c3973fb35a64133de41c211f2802b14df54cb618cbae4adf662d822a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1A 16704 bytes
font_01_sfnt_off0000d7fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 16792 bytes
font_02_sfnt_off0000f012.bin
0abe8d2433dbe1bb74f2e552bac20ec77e89d64513d32c59db034f7d80c89b62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 10612 bytes

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