Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdac1b4f63814af7…

MALICIOUS

PDF

119.0 KB Created: 2021-08-17 16:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5194ce0181fa100c02b025e9f29d5dd7 SHA-1: 1c7191e1f2f9cbdc7d6a9d89881d2386d1fe77e3 SHA-256: cdac1b4f63814af737ca8d3355617ab4aa74c22e79d1128324fe8d61c25259bc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to direct users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9665

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://mt-filtration.com/uploaded/file/148175935760d3d4f41087e.pdf In PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae16e4d1227---luwokerijuza.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcee823631---88558172464.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df774e73e42---dibadazekugenutatizazod.pdfIn PDF document text
    • https://businesslife.com/content/file/21106346838.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/finikenujidorokasus.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/78852206203841340f3449290fc2bbd9/dabunotaboxorowuwu.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/80401821436.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/dotenagoveramenadutufe.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/xekodavasuxizejaromi.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/5741636081.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/v8n6hukvn5954ioqjckmvte7em/tijejanivub.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/33aa152d8982db07f990f59bc2c8a762/48698464750.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/49242737247.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/napekumomafunanam.pdfIn PDF document text
    • http://samwha.com/upload/userfiles/file/2007835218.pdfIn PDF document text
    • http://1976ahhs.com/clients/32223/File/69368114983.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/xojekapideme.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/miver.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/54714264377.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/98202064959ba989755c6ebb23ae2abd/gifofi.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/sevafadezamabixa.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/63k4csioq7ho052kp5km827k7s/72644489648.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91e76fa49---68314537304.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/negajozogun.pdfIn PDF document text
    • http://angkortaxiservice.com/userfiles/file/28355815759.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/84553914230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=euro+truck+simulator+2+mobile+android+oyun+club+indirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15392 16508 bytes
SHA-256: 60a1875f6e998f60bfa3e493de9c9d998818e315c3cab391772a90e0fc5db5bb
font_01_sfnt_off00016a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000182b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182B3 11080 bytes
SHA-256: 65a1a86b8317d1483a960cb35ce206eb9845a6ec34521f02b376e0da05fb58c5
font_03_sfnt_off00019c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C9A 18180 bytes
SHA-256: 28c7e4e6ba35e8194c9d16f9d25c17f9e8fdc3ecf8dd7505c536faf3ed3fa2a8

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