Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9b935beeb64e1f…

MALICIOUS

PDF

94.8 KB Created: 2021-07-05 11:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4d7fcbfa367c9d1425e7fe66446b79f0 SHA-1: b99652470af1ba590120dae3531baa3fbf64e632 SHA-256: 7c9b935beeb64e1f80bd15ebdcff8d38ed59d7f85f596ca84e5017235c51bc82
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised WordPress upload directories and other potentially disposable hosting sites. The embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://penzionradvanice.cz/res/file/35898077413.pdf In PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66e960bf03---dizuru.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714791e6b2c---13435563602.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/rogejoletozerujisebinigot.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/xopoduzasulugutubeteriva.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/ruvoduf.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/lopupobogagil.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/98901103323.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/89069921301.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16075b44555141---49875342345.pdfIn PDF document text
    • https://airshow-bg.com/file/jedesizabimer.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099d0c50a3d1---vonizono.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/gupomasawebibafinevibuju.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1a9a79e7e---malarexegerokiwaxepoxav.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/maxut.pdfIn PDF document text
    • http://computerdoki.hu/user/file/92957637648.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/zezefugupizafejoximu.pdfIn PDF document text
    • https://medtek.vn/storage/file/98334841099.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/168eb75a0b8fce930ba1834651835473/puroz.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856a75ebd36---61069749829.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/45927274081.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/92df4d9ab2ef716ef78a5681045c04ae/12590843906.pdfIn PDF document text
    • http://bdn10.cz/files/file/98037094543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=economics+word+derived+fromPDF 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_off0001081c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12033 10464 bytes
SHA-256: a4ebca3fc62ca104b032b338764545942b802f59f266540d816cf8779d1c8e64
font_02_sfnt_off000137f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F4 20312 bytes
SHA-256: 781286f335def7640e0ff26e2ffdcdda2a0611c8ef7c3ee5c98109325af24427

Open this report in the interactive analyzer, or submit your own file for analysis.