Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23f4bf867bce3a4…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 17:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6cb6c3a8afaac628e531d7e7e16ea6e6 SHA-1: 876c71f9c55104f8d05e2740a3bcfbcc527ce840 SHA-256: a23f4bf867bce3a4953b17d6b2f14445d0165414c2306dd3b18b05da5d699d5a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://drafthe.ru/uplcv?utm_term=baccharis+articulata+pdf PDF link annotation
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bn04crgf4m2vstt5gjnd4lish5/gaweberume.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/bimegokikilinurud.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/87795409956.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/reieppi5pmir4kjg492csrpbtu/duzofi.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/turadamemosilobumi.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/74065381162.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/63807551884.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/17784360319.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81053906693.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d60fbafbe959a79f954c7945c74d33e4/36951210194.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/balekifidarudavab.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/8457717164.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b3vdi3dp83mt0jcf6drcgaj2r4/96914090095.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b0ad4364619f7985ce614456b3dd1599/82523379720.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f974d4c176---larevunobosoxedenakamopan.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2603bacc46ff3d81de1d63ca1840d61c/zuxotibenazan.pdfIn PDF document text
    • http://moristas.com/userfiles/files/39299553169.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ea1cc303283a3d5a848a15ae2378b5ac/52116313377.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/lavoturomadeser.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/nusazufejilu.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/61474959470.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/67834044824.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/bobisusabawugefon.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/90984939205.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/0cbac0975f73c887dbadf903de6ec19f/lunubevaradalijovumut.pdfIn PDF document text
    • https://majubesar.info/contents/files/66412578242.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_off0000dda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA2 18952 bytes
SHA-256: b618d98eac2552fbd3fc30e2e98fabec27a631042381c7a555458ab2adcff20a
font_01_sfnt_off00010f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001277a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277A 10512 bytes
SHA-256: da09ff0895d847f74c09234e7c45675a7f5982ea9b275831a132e11d43bc7097

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