Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31f99da994b1933…

MALICIOUS

PDF

74.5 KB Created: 2021-08-15 10:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c66516a68eddadbfc89c5ac816ed897 SHA-1: 64fea55f800853cc88deb5d28a8dddda2cac9c97 SHA-256: d31f99da994b1933999a76b2dcc85226a53250ff103c0ba689d10bddcd54599d
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external URIs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://medvor.ru/uplcv?utm_term=free+afrobeat+instrumental+2018 PDF link annotation
    • https://dildendilecevirievi.com/upload/ckfinder/files/13924624998.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31b8ca2421---52595445391.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/jujajorotedufuf.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/28936716625.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/cuqeqkrenccl7m91v10vuabj2s/jinoxupamilimodi.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22895a9759---47422296245.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333c5a7eff---92578768543.pdfIn PDF document text
    • http://cy2hand.com/userfiles/37614352572.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d30de93cb---25637330714.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/3043657201.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/kqmbcjtb5ug7983mvhmetmr0vl/9237274275.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/somufodadesu.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/bukuzofuxesewisuw.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607777439b338---60991028819.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d15d7cfae7---24735599394.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb70cc60f---lemiwirulije.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e2d78d32---mifakiguduvimeti.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca62a43532---52312485544.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/xubilezetij.pdfIn PDF document text
    • https://beaszemin.com/files/41091480334.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/31343052228.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d236a11e5677dabcbabd0175a15e1f8/sebukipezaniregolos.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/wapugodo.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210527174438.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_off0000c089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC089 11096 bytes
SHA-256: 420f634513301a954c37b8781feab8e9b12ecce077a97da293b35b28a9742f03
font_01_sfnt_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 15988 bytes
SHA-256: 2d8634abadce0d3ebaec67d12597eca958a694e999c536f0303aeb036ef6c770
font_02_sfnt_off000103ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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