Malicious PDF — malware analysis report

Static analysis result for SHA-256 67be532780cc3d00…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 02:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5646194f28ea2f83a71b0f57a9786d7d SHA-1: cb562c18a44518ec8d6376c23b7eafd23fd7e754 SHA-256: 67be532780cc3d0075f3b6f52418cdc2c6024c814fa08fdf2bcc02a659582af8
156 Risk Score

Malware Insights

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

The PDF document contains a link farm directing users to multiple websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links, including those pointing to compromised WordPress uploads, suggests an attempt to leverage various hosting environments for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ekolojikweb.net/upld/userfiles/file/56182915347.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a390b867d2b---49876674100.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b386ac3116f---madenitaguluz.pdf
    • http://mjsolankifoundation.com/fck/imagesfile/6658489170.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160afa67d736c1---lunogulebizuguvisanevuwe.pdf
    • http://hoaisonland.vn/upload/files/16490074927.pdf
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/mazidejezinigotuvo.pdf
    • http://www.centralperdana.com/file/leburinol.pdf
    • http://atek-ent.com/upload/file/gekowexa.pdf
    • http://saigonradio.com/userfiles/file/wivogegesotimapobevaruwap.pdf
    • https://apgr.eu/UserFiles/file/94975292856.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/lgnnm49aagha5sh277a7pagnjr/54359189956.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/26jrp4h2e2qe6p5upsvaq4nik6/jumabu.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/99jg74ts4r2t2omh4tg90br11v/21309552916.pdf
    • http://ventmetal.ru/userfiles/files/48438161107.pdf
    • http://naturallabs.fr/userfiles/file/94276790410.pdf
    • https://sailstudy.in/ckfinder/userfiles/files/19069333653.pdf
    • http://oiseau-bleu-morzine.com/userfiles/file/8406857842.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6b29d980a---dojuvisiseveredifeze.pdf
    • https://dveropolis.ru/upload_picture/vavoboluzotakaxad.pdf
    • https://clinicamanila.com/ckfinder/userfiles/files/butalesapefaditewibis.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+remove+blank+second+page+in+word
    • 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_off0000deb3.bin
b96fc1c86bfe2a7893b9f8986c6b267d3d4d0d0c8d6bf82c11ae4db34442da33
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB3 18304 bytes
font_01_sfnt_off00010dae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 16792 bytes
font_02_sfnt_off000125c5.bin
8765627ff8b39dd4f471087aaf1760c6233736f80c01cf1593e644faa43cbc08
pdf-font-stream PDF embedded font (sfnt) at offset 0x125C5 11232 bytes