Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2467494c6c7d104…

MALICIOUS

PDF

94.2 KB Created: 2021-07-13 15:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0a1511a189fb5794f914f9511cc2f6f4 SHA-1: a68808f16dd46fbfdbc5fa1a259b7bcf706eceea SHA-256: c2467494c6c7d104569e06ad848deaeecf112acfe618bf436e334366f8271678
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

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 http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9ee850d3---34549030301.pdf In PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb53a12be9---dolibinisawif.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/welevipemutafoz.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/sireboreminanimorute.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a4213e01ac55c48299241b6ebe80374a/vopuputejiteso.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/v571kjdi9utjh1989vtajcgq64/xuzodafesuwubazapunati.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9a3d0bb6f249f4cbc79f9d0cfd504800/sisolosedovuzomodedafa.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/bokaze.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/pulejefigigifudedusutu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/o2m462acbeq6qkq15vhg7uaot6/databilimepazujepozobir.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/tevusefojetuzarorebam.pdfIn PDF document text
    • http://belst.by/upload/file/64203937642.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f19e32bd8---tixixarekime.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/pedix.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210530_91AB1275D340C454.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/1458326370.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/jufixukekaxapasexez.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b22414d220---89505579531.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07be8i0726kaogmhmjliagotl3/46253996599.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hplgfh0nse431h8hbjmufemf45/vasuzowosajibozewemutet.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1beb842782---pizibivukimadotowax.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210514160217705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=letter+to+my+unborn+baby+girlPDF 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_off00010d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 17548 bytes
SHA-256: cc1ee70b754ff5471743b6bdcac8fdac4d3a3405e21a5e06c92ec78df5e332d8
font_01_sfnt_off00013b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6C 10596 bytes
SHA-256: 7a1d16e1b7cba5fa6c34f7eb1fff4c632e387d2dd28f29bb3b34bd3521e9b868
font_02_sfnt_off0001539e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1539E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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