Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6fa6fb537f07e6…

MALICIOUS

PDF

77.8 KB Created: 2021-09-20 10:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 926cc5fe5a93e49845611fd4d3e8d07d SHA-1: c480b9e411f59c77cec50bbbedcc642ef1d17c67 SHA-256: ca6fa6fb537f07e698139f5ffded12eb5ff07ca59348f0c79a9c85f94f487cd9
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://antasboru.com/guvennet/resimlerfiles/37478995793.pdf In PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/palowoso.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/garinunilotaj.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/59111475851.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/xibotanutokalosisiviz.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/gilivezolanesovowexeguf.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/jogubebo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/2914eafd9a703daccb0d876e018811ec/42558050850.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/88407145377.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317f177eec3---61722383182.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a77f029299b34ceaae16227ffc77f162/49613911967.pdfIn PDF document text
    • http://kechengchem.com/upload/files/76219883468.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/dupawukevawamoge.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/70025413460.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/gapokanevosilabimofefe.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/70492effbc8da3d11e34b36942a5cf34/xasonumugosaxalivame.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/7c38c6a99362ffdf5f2b95b96f6f58d3/97114576201.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b81568c9a7---70367505867.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/28109571166.pdfIn PDF document text
    • https://hklh.vip/data/attachment/file/temifiwuba.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/wuxarimudatazatemi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1kecdt3fm48if574dmlesitih3/34205720518.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/26011022396.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/kijam.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/fivewegimizafaxol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=buy+primos+genshinPDF 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_off0000c2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C5 20796 bytes
SHA-256: 7574b789338e7ee2239845a83b23b4a8867a21487b1ad8bcd527117fef93ccdd
font_01_sfnt_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11126 10660 bytes
SHA-256: c9a1c20d7f9d619675a9e8cd7a74add505df8d39b894fea2d49e7c06b565474a