Malicious PDF — malware analysis report

Static analysis result for SHA-256 82308f54a956f212…

MALICIOUS

PDF

88.0 KB Created: 2021-07-22 00:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e20f408c232f8cfe2a75b2e4f477d39c SHA-1: 5c552ee4f170cbc7c6ca90e2561b42a1f3a4bf2f SHA-256: 82308f54a956f212b2a34cead250a0296df2606c47406c3c31e3f9d1f520637b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL findings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://sgyscom.com/upload_fck/file/2021-6-21/20210621022602508231.pdf In PDF document text
    • http://pwmtqatar.net/userfiles/file/91467940541.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e31048f862---8328711735.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/1746636587.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/iir013tqbg4kf6mg5qrtq0m5s1/32201956335.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/53258803358.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/zotefowatemiwamo.pdfIn PDF document text
    • http://www.grifin.sk/files/wulijajobibodetitalojoxu.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/pojuxunalijekopef.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/1e7lchjeqembq0kr0lchjk0h8b/degugukude.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/135c0c55f4e572e4542b4ac3116fb7ee/xubamerupofegozetoj.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffc5cb4ce8---zenulogovugipejizu.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0d64dca65---mugalid.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/bivumufopaniwokapivozora.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/vunimepukajo.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/42531498365.pdfIn PDF document text
    • http://temple.mo/userfiles/file/novijitetadaxisof.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/karotenok.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/g0b0o33m1o8k3hnkimp2fc2e3l/83994585422.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/heift1f0om0uvg6jq2lb4k044a/43113925781.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16089bf8bda4f4---53504718307.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/39913480819.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e111ab5d6---velikegowonarabanup.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/mategederodufatitutaxotuf.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/1bj48nsnrk0duj86rnv6v4d313/xigobunabinukevawusek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=can+a+child+travel+to+the+bahamas+without+a+passportPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 17104 bytes
SHA-256: c095ecf210a7750ebde9de09528de44442363da73adbddad94a81875dfe7fc3f
font_01_sfnt_off00011cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF7 11200 bytes
SHA-256: 8963cf60364904d903ddc8642a7790a2af7f93c8708ae191a753f64f4c82600d
font_02_sfnt_off000136d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1