Malicious PDF — malware analysis report

Static analysis result for SHA-256 424158cd927535f7…

MALICIOUS

PDF

91.2 KB Created: 2021-07-01 09:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 922bdef8a1e513cbb47c73d51193af9b SHA-1: 4216b6b2eccc3d6a4214248a5d18cfd8fb5ee337 SHA-256: 424158cd927535f7b7b778552a696932a214c9e7e09117301cce0e77ae3c34e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the final destination. Heuristics and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0cf0a737f8e312f0603e60bd686df70e/85799553139.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba60770ab6---fexutorawosis.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a70e14c76d1---jerisafewepebav.pdf
    • http://orchid-daikanyama.com/userfiles/file/rawenimev.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c92884d226ac824a4c658526112a9e5e/vixawekeposefipoxi.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073670486c20---92455659098.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/a99bo8lqt6p6goqq1ck73b4v4u/29403875522.pdf
    • https://7gking.tw/upload/files/kuvuxi.pdf
    • http://eltonltd.ru/sites/default/files/uploads/jikigezufegit.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b5101a05c---69415154580.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd97b0f2bb---dukapinedadifiwatarikozik.pdf
    • https://adasms.fr/userfiles/file/bokobojudakasisikuguk.pdf
    • http://ndc-group.ru/uploads/files/77609433308.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/wenivoxetakidomalekumifu.pdf
    • http://copy2d.com/ftp/image/file/bejonozepi.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3801f3c048610b540c0ddf237c0b6266/piratopa.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/23lrkek8gj2rltc76gvkj94cfj/19127478796.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/o3bi5j8o48gslk4gk59opdlmd2/vewiwerokugagupi.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1a81d900c---82825450471.pdf
    • http://reklama-kemerovo.ru/files/files/33830030542.pdf
    • http://mav-auto.ru/images/file/mibutemegipexe.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b84a66afa9---guxixujamufiretalora.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=molecular+biology+and+biotechnology
    • 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_off000100c7.bin
25128ff6dfdd8a6486ff0c2d5654caffc329f69131b5991143515f28266ad8e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 17492 bytes
font_01_sfnt_off00012efa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFA 16792 bytes
font_02_sfnt_off00014711.bin
33a4237d7a186942651a0cf2dca05ef312824778cfd258f8383f0c5eecaea7a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x14711 10828 bytes