Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8968b6e4b533e11…

MALICIOUS

PDF

85.6 KB Created: 2021-06-28 03:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a157840b924bcd32b30abc65d907d379 SHA-1: d0937d28c66484fff31089bc1b93e89fe10debf8 SHA-256: c8968b6e4b533e1181893a22da244b9d22cecbb059d66c158ccbdf3761d9f1b0
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. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

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 https://oniceh.ru/uplcv?utm_term=difference+between+record+of+the+year+and+song+of+the+year PDF link annotation
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/512e5917dad1a4656eb968593f68fe02/vanafelipoparofaliva.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2222c7167d---31736815521.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1b1463dd7---rexefona.pdfIn PDF document text
    • http://ciskmv.com/css/file/72495964065.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/dituwawesusajafixiw.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/wuviwegulag.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/55331389679.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160945123261e1---legunisamagazikomi.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/mewotus.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/31286232882.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b875702808---bubonobepupizadeji.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/89206ff12e42ec250c09f2f9018bcf89/21868445177.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/17n5ttnujsvsv0r30iqf767l1t/11599191320.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/59c4d82697068d1fb1315be8138c5d5b/61879940579.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/fojolaxalaxaf.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/46331203079.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160938523b7916---sojapagagen.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160815b9f0e296---bepatarawudigu.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/71503068223.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///mokedemalidalidawewi.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/34ff3a45192e7ccc66fc5480d5ace5a3/35748638615.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/49ffaa27ace8b1f088bb22dcc16a8688/wojanofalidurikejukivam.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/bfdccap13uomeqiph3udh62hbc/bobofovimiziwotumo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B5 17528 bytes
SHA-256: 5df03651c31a0b166439dde9e2a7c4817cbd29308c0687d66633b973c8a0d455
font_01_sfnt_off0001170e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170E 11048 bytes
SHA-256: 4cb14a8612bf807d738d32f6a20e71c8a5bf1e70537922a7d77b894968edcdac
font_02_sfnt_off000130a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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