Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce961adea9c542f6…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 20:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2cceaf26cbe4ee6658e189355c29138f SHA-1: b4321442a9c9714e6b8e06570a5ced644c607db2 SHA-256: ce961adea9c542f64e858debdf5c9b1bc2a5160941c1b6019b56dc2e3b870f6e
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://diamond-marketing.cz/soubory/24094715906.pdf In PDF document text
    • http://memphiscentral1969.com/clients/865565/File/46208492033.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808be155019---17455934311.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/41464988153.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/50708361673.pdfIn PDF document text
    • http://axwelindia.com/uploads/25389687308.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/jozewutividufetovujas.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/wuzeguboledi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/pdop6ntrtfp50e2uglllodpf2u/kolezixurewapovaxug.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/51556113429.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/60a02876ac27f1dc838eaceaf99ff9ac/17618705600.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/16460865662.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e57f562810---61532117393.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/60327405180.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hp4cmbl5l3mrukr5mopdkkjev1/26399409609.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160853473019c6---wodagud.pdfIn PDF document text
    • http://4bx.pl/public/file/neratopelikarozeweziz.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/27796864657.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608baba6c71b0---64111442565.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/4251423174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=elements+compounds+and+mixtures+1+worksheetPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f01eed89d3fe1921f4b2a3d7697712b0/kukajabipev.pdfIn PDF document text
    • 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_off0000d32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32B 11196 bytes
SHA-256: 0122a685491caad3adab6790ed3ddfa1b6354f2f9bb884adabf054e864d8c8d8
font_01_sfnt_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 17748 bytes
SHA-256: ae36d603d07f2ed628ddaf56f8e2ce3267fc9b0537936e6901059c00036040b2
font_02_sfnt_off00011b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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