Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20dd7d9825740fb…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 19:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0fd30da726cf547925337ffe526e52f5 SHA-1: 6c3ea2eca7485129b45767c400d293c048aaaa89 SHA-256: d20dd7d9825740fbb0a99feb433abcf07f3b5f0ae20013cf25f6bf8d096ecfad
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting. These links are likely used to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://iweldbot.com/ckfinder/pho/files/20671593470.pdf In PDF document text
    • http://rs-entp.com/upload/file/ginilagifugakow.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/69055216492.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/tifasado.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/vanatamixuvowijimafamipad.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/papodowufen.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/lavesaludig.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/59483210644.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/susarojofeto.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/97295732281.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/57718181518.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/32832702198.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327a9569684---komisilirijenejakedapiga.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/51676975168.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/mimitapuv.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/14117939615.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/tapozusorek.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37124960116.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/fhqms60ftjca2mleh52bi3ffbl/zatelisaberalatatejup.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/wigupememegivetileditik.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/83044011504.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3ca606203cdb640f9297b8cfe47c3f20/jidawuxalovatibugugamer.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/tilekasurigojowivimafekuz.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/33721474468.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/purof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=edema+pulmonar+pdfPDF 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_off0000d0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B5 18804 bytes
SHA-256: c42a94d687af09ad881cef3aae16ce76b2f6daf8e87ff08d66f2ecbe67b44d2a
font_01_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 10384 bytes
SHA-256: 9dd7b64ba7dc1e980b25199f4910e3299f5d9b5154ca0790e23a7817f998351f
font_02_sfnt_off000118e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1