Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d0277db5610e7b…

MALICIOUS

PDF

80.1 KB Created: 2021-07-22 08:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2b7c10bafe761ecd66bbe701c02a13b SHA-1: 9c4fc43f23107769b835291619db66c40fb815ac SHA-256: 33d0277db5610e7bade682cc9d5694cb9c979bee7a840c9e2fe8ade2ebb4eace
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, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://baohanhranghm.com/upload/img/files/30141298706.pdf In PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/62879184293.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087f7237a4ea---45040049724.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b783a71a---disuzuf.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/qlr0sb635qne6ir875a2m4vps3/bamagibiro.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071da88d4a33---94946882355.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/gexakakobufonusuj.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785a065da6b---jobikegujixonusas.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4148118f55c294a16b0d37fb3bfaf9aa/92670966408.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/zorewibasik.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2ca2e62c---18564835666.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/81284782578.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/69390804766.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/42664562551.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/11pk0qb1def10ksrnvdu12kik8/22830982284.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/12233292647.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/bipubuv.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c948a56ddf4---72134728447.pdfIn PDF document text
    • http://teraval.cz/res/file/pizitunevos.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/cfead38a847206b503a5a94557631087/58920461502.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/zonigovemolidupuniguvu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/karopewivufepumu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f75e673e830---45596758501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+quotient+of+two+more+than+a+number+and+eightPDF 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_off0000d5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D6 11020 bytes
SHA-256: 933bf04402b69cb82444592da8c96808ae381d640f7cfdafda6fc80b8ff263a6
font_01_sfnt_off0000eeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 16760 bytes
SHA-256: 5753205541100bcfc71ce70e14308fe73c49decb3e80ff3e4b40c24d4022beff

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