Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4636a410e1186a…

MALICIOUS

PDF

108.9 KB Created: 2021-09-08 09:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 49037a8cfc3ba441a8739ff8f5ac3dba SHA-1: 75184c6eeb2f01f54cd8373177d690c06a718fc4 SHA-256: 6b4636a410e1186a560a4ff2734925bdca89e570758849cca5e677e837337cab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, likely intended to lure users into downloading further malicious content or visiting phishing sites. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6r7j00vc4tigqquanjplpfh9p/88007617788.pdf In PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0855c5822---42979017438.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/72252030728.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/lebudarubisirosufinuvusa.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/65933456062.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/37e824618ca66f3ba4cc19cc8c529b60/40739163375.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/75179556251.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/lazebororulezej.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160727b95c8c13---72323612408.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/ludubukifoxevufo.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/tcknpalkmqnskrbskc42kv1l72/13575617148.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/51075934796.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f012c5d26e---96557941965.pdfIn PDF document text
    • https://le27.fr/docs/file/wonevobexani.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/50973523544.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3462d27e188e5e0473def4d0fd4e56d2/rumugerukoto.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/rolururubemutumisibe.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607542f296d63---kosidunipavutelimimor.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/394f704c8465a45ac5d7cbaf864d1d55/fageremiwijobosifebovufip.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210729_0176FD63337BCC47.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6284b82bdf---pifiwulazosewabodege.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/nuwasur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=resume+format+for+freshers+diploma+mechanical+engineers+free+download+pdfPDF 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_off00014070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14070 11296 bytes
SHA-256: 07a72d6f011c4d0810c123958cc10f6d37dc6b70dd3baf07638b7884e9a22de8
font_01_sfnt_off00015aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA3 19080 bytes
SHA-256: bd6d7c45649fff5017cc3066a2ab51db6d30f2494fdd2d52c39a812d5c543c63
font_02_sfnt_off00018cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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