Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3939bd3abaaa803…

MALICIOUS

PDF

94.8 KB Created: 2021-08-08 15:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 18a770b5ab3839c53bd752013cba69ab SHA-1: dae8336b8eee0c578413843faee503685a1d7c8e SHA-256: b3939bd3abaaa8031fc8d91f5b051b36ac568aa304172e52c81661de38db3e41
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

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 https://medvor.ru/uplcv?utm_term=funciones+de+asistente+ama+de+llaves PDF link annotation
    • http://capital96.com/userfiles/file/98379072702.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/57407091182.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/mozagujox.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/1ca504a23b41c01a17dfc71c846bc417/69936725480.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/56530087353.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0deb43f831---benarupukigutazatagifux.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/lajezosasujaboxiko.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/retigukagoropozepo.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/39945936420.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/cecf852e803abae04224f42ab88cef60/51994976860.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/677b503c6fbdc651e4bed3659c3ea5eb/nedurokinilagudoxas.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9063c19e0---52975667262.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cea2c938d---33087125779.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/88170789689.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f2267006---rupejubenojeketowus.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b328e2e1e52---55795687041.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc249cce22---20549582832.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/86ddb3rvk5jj2mnbvca0nmeamc/fikimamemojajevigaxozafu.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/kemedofasumonaxak.pdfIn PDF document text
    • http://letdentalab.com/img/files/bepekatofotiwosukibumefet.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d46db01c9e67c605084280aa8df1acc2/11245475065.pdfIn PDF document text
    • 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_off00010eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBA 18360 bytes
SHA-256: e6b2a1ab12df18aad597290caf478dcfdac72324568fc9f1d3693883d403f059
font_01_sfnt_off00013d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000155b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155B5 10576 bytes
SHA-256: 52e198218d356c93e81a158266fd00b0082d85432fadc9405d386b5eb9cb588a

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