Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d37f22dda9f873…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 16:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5440ee8abe1d176c00abc4c22f220fa7 SHA-1: 96513a9bd3eb20e9d314502e6cb1295356acdd6e SHA-256: b0d37f22dda9f873a92e0393462a0389bcef4639858894e82ad347c59807b21b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to potentially harmful content or further stages of an attack. The presence of these links and the overall structure align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e0b7b75aaf2790a629ce5162c44e1760/vanomakewubupupegoluret.pdf In PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/kodavejimexigi.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c98a418a0e---89958028643.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/lesomabatasewegudut.pdfIn PDF document text
    • http://gr-chem.com/upload/files/99941039230.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/kosatiketiwenematom.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16071dc7b5ac45---tisaniredatipeka.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/9e2ef743a903bcbfe67b5eb04a59aa12/94680809896.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/42248556856.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/84224340415.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8119fa6374---nitanodekikeluludolaro.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/vaxatefobijuzalovefudapon.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/jpg3v5nq53210hnuh53cb3jv87/bekazazovivisavidezibimov.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac786bc4f---zaduvafefaribifimex.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/acadb1c482b79966c7af73075009404d/povel.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/kv5ckcig7pgouphto159t3edh6/49206922128.pdfIn PDF document text
    • http://christopherdallo.com/file/45965319297.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/nanatuperoxu.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f41e8de9---didalodufusopekumirel.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/navojiwuvakesekex.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9ab5bd13---39042340241.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f54dbb4fa---kimotubarezoteperobit.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/fovajejedew.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/870e59d95dd53d49f2da7bc7f58ffbd1/37686020048.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/32539277204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dental+photography+techniques+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_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 11260 bytes
SHA-256: 80420e3df6c9d601267fd5c0ea25ab58fc5a407381e5c5750a6fd993353a65f4
font_02_sfnt_off000114c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C5 16696 bytes
SHA-256: 805ba927e327eb53e29a3477a6e19dc23a490f81915f5115d2331074169f3ccd