Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bb268382acbf5c…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 05:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70f9cbc1b702dd3e22c2a3e773e9a45d SHA-1: 814ae7b903275ea20071e08baf8b841818a9b736 SHA-256: 73bb268382acbf5c95c9f74d58444e6b9873a9e1b6f281d1ee6f8f39733727ed
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the exploitation of user trust through redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hanyauntuktesting.com/contents/files/nizagivuxabitabixugu.pdf In PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210914065546.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161416d213447f---7911361743.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/589db5b5b8a0a6653ae0114f7d9074ac/fugalifijixo.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/58855952093.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/45083283131.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/pijamuzetaf.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/xapixopejedurimijejun.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/zexekarisutatezokodotixob.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/zuzataxenobufedupexulaf.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2s6o02rjtkbb90s64mhjlmmbs2/37056397130.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/63074935409.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/jaxeragomosudogofazavu.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/81622887661.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/578442275.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/fowaxipefulowufe.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/lilupewupopipove.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/sikaputumilovus.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5814baf0fc244f191a26d31b5559aa8a/romodutalizawez.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/77684441536.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/58518416592.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/8303332d7b63f6c805000cc2fea162e6/dakarinamubabumajudasus.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/b45bf98d70e34108280841dfa383b444/66175172269.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/fuzekig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=madness+project+nexus+jesus+modPDF 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_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF29 18600 bytes
SHA-256: 9a489c90b5b5f0347001f71e0a3f852045d0f0861bc6dcdd611a210965e6a6ed
font_02_sfnt_off00012f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F40 10860 bytes
SHA-256: ab045e648c7c65d3779ad2266c545a779c7eb4379e7530c700badf93238f869a

Open this report in the interactive analyzer, or submit your own file for analysis.