Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc5251d5f28ad7c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-08 15:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4a42b61c00a30cb7d5772bfa6958ed6 SHA-1: 87a2fc1a02f715f9187fc1824fdcb498c6c70603 SHA-256: 0bc5251d5f28ad7c953e1fc5d0810c0e7e3c1ab078f872824a898a4319e8b179
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ansing.nl/userfiles/file/bepazavipegupotupusuwawoz.pdf
    • http://herningbadintra.dk/app/webroot/upload/files/puwopup.pdf
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/wodebutesema.pdf
    • http://sashtraayurveda.com/ckfinder/userfiles/files/1524410280.pdf
    • http://studiotecnicoprato.eu/userfiles/files/maluxuziguzokopa.pdf
    • http://ortopediaszombathely.hu/editor_up/49664248418.pdf
    • https://mandarinusa.com/userfiles/file/1630761013.pdf
    • http://workontext.ru/media/file/27987846808.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161311fd2d040d---kulimumofix.pdf
    • https://reparation-mobile.net/userfiles/file/71203003348.pdf
    • http://olympicburger1988.com/uploads/files/66929269109.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137317431ee3---muvaxisaxexoxezigidovo.pdf
    • https://denizlihorozu.com/resimler/files/57289426054.pdf
    • http://leebyunghun.org/new/upload/board/files/telovukebemaxuli.pdf
    • https://acrgroup.nl/userfiles/file/64569273836.pdf
    • http://onelove.cz/file/36069389315.pdf
    • http://microsolder.hu/userfiles/files/65984632770.pdf
    • http://zoop-tech.com/ckfinder/userfiles/files/lezefuzizubavulevepigi.pdf
    • https://csam-villepinte.org/uploads/images/file/kirovegize.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613791167adc4---46552983265.pdf
    • https://matteagianotti.ch/userfiles/files/64018193877.pdf
    • http://metalzilembo.it/userfiles/files/dikavudirolabomifur.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sicilia+e+magna+grecia+la+torre+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da41.bin
f304713f7233a6fac607fbb8964d788b1f9dc687ef156300a7269b6173246045		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 10868 bytes
font_01_sfnt_off0000f31d.bin
f9e3f79ccf8109710700770b43137c7a088e43ecf7961e5ac931438fcda0804a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 17840 bytes
font_02_sfnt_off0001215e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1215E 16792 bytes

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