Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6801246cef90968…

MALICIOUS

PDF

89.7 KB Created: 2021-09-11 00:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cf421bf91c03d9c740f3c60ad98bac70 SHA-1: 66933178985077711f6b7f2b14582ee8ae0db024 SHA-256: c6801246cef90968ca56c52f0bd3bc36e441a5b345947bfbcc0913f345b9d1b1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://ourdesign.hk/ckfinder/userfiles/files/sejik.pdf In PDF document text
    • http://standardamulet.com/files/files/zabozivanuwiri.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/wasum.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/24980482.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/nurodidiguxajuburovinamon.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/14481910866.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/28991a073eecc1a295d399285c17196f/tofuliripawetesalot.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161387b470d36e---17287631439.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/4i4i014utootaf7sfadm7v5j70/guberowesuvusudilorigiwi.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630956895_1.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613703f16a0b0---dusodu.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202193_33133_289.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/84170393149.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/nesetarateram.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/85029543750.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/xufogebug.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/fepaferagotizoripapa.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109012354417221.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/34152457861.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/lafazedenuxotixudawetewu.pdfIn PDF document text
    • http://gekon.net/userfiles/file/guxiteba.pdfIn PDF document text
    • http://519pf.com/userfiles/files/42117893698.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/rilorim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=days+gone+2PDF 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_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 17300 bytes
SHA-256: 9c6e76d1950d9accd82bda73867557d2c1c94a3599336130c383b3e3d682f38e
font_01_sfnt_off00012a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9D 10180 bytes
SHA-256: c8c1dee9556bc0c0be702d037b09989bd2221161c022d3a291ff5fd5fa941be9
font_02_sfnt_off0001419f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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