Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd3f43ddf5eb0c5…

MALICIOUS

PDF

91.8 KB Created: 2021-08-06 15:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb0db92d57bbc0c926f606f2d1eed907 SHA-1: 486c57ec76beb5032757b676e0d8dab1635672eb SHA-256: bfd3f43ddf5eb0c52027d19ecc4c6611e99944854a59eacbbbf9966e7ec86bc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains. These links are likely designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://harperfamilyreunion.net/clients/3/35/3566a42c83b0accea4ba2bdfee5c7976/File/porosenowoloforotidalu.pdf
    • http://dogalakustik.com/depo/sayfaresim/file/95960493539.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/eds1jrruch5su299aukshiu6q3/82856571282.pdf
    • http://hanboo.cn/Uploads/file/2021071603264470554.pdf
    • https://armenia4d.com/contents//files/mimas.pdf
    • http://tycoonmedical.com/userfiles/file/98812884867.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd66b4673---megeminubos.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c5a5f80d84e87a21cd6883269dccd05e/75018681993.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c2b76268f---72022021275.pdf
    • http://ventilatoryzlin.cz/images/file/xizolu.pdf
    • https://agencement-menuiserie-var.fr/stockages/files/divolijoxogutafonikotixam.pdf
    • http://ahrestygz.com/userfiles/files/20210717_010126.pdf
    • http://jjmcp.jp/userfiles/Image/file/milukutabuzajexep.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c583a9da2c1---54436601969.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/3007d66bb20721737711df7451697c9e/3676078491.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f327c575830---78062598018.pdf
    • http://santamariamikado.com/uploads/files/gotopov.pdf
    • http://servmed.net/userfiles/file/60596229891.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c28331593---kajamogaruzumulasasog.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd8850635aa---wilemapijujutow.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+many+points+do+you+need+to+pass+your+driving+test+in+florida
    • 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_off00010260.bin
15fe9d1edf9ca3a6928bc6a51ddff484e8a79b1e1018db180dc69c735fb43ebe
pdf-font-stream PDF embedded font (sfnt) at offset 0x10260 17000 bytes
font_01_sfnt_off00012eec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEC 16792 bytes
font_02_sfnt_off00014703.bin
5b825c77b79c393616e9553cbe83fd4391237102b6a9a863185e44902345b76e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14703 11196 bytes