Malicious PDF — malware analysis report

Static analysis result for SHA-256 113586e6e054ef60…

MALICIOUS

PDF

170.4 KB Created: 2021-08-14 02:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c79cbdbe391666d3dba4c1c26c9c541 SHA-1: 7da459edcfa81545b821baa84fc100fc5be751fb SHA-256: 113586e6e054ef606bca2a7eaf316ea910f9e089513912681f8d4bfa0ef12c84
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable domains, likely intended to lure users into clicking and potentially downloading further malware or submitting sensitive information. No scripts were extracted, but the extensive use of link farms on compromised infrastructure is a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://infrive.ru/uplcv?utm_term=cuaderno+de+trabajo+quinto+grado+respuestas PDF link annotation
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f4ec20b65---22482632099.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085497ddf1cd---mibapinutefoxinakebisev.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/da02dcd02f3b0b258db50ebd163f157d/xuladowenerozuliraju.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e2071ae4438---lujogujawebowikara.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079749c6c5a2---gefemibajotu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/60867908585.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fjtm8u33t1ubi81nn2rniieap2/pevisuze.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/30124629803.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/rotezifaboribuf.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/34970637062.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5817559f36cf19d5a65bde32cb4aebdd/bibutituwuto.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/77638977252.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///79759407639.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/54936dbbbd9336a3efc8a2edb71d7ccb/nexikozujijisibesuzaxarap.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/wisefudivaguwaxasonilov.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/51d54ee91e5be2b252665e2bd87c182f/badesegudusafuwinufararu.pdfIn PDF document text
    • http://gr-chem.com/upload/files/zapuvukodamavajujanagasi.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/72249956076.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/91867285115.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/zovefuxedusonexuzi.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/25828378604.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/0cee9f97abb6220d66e9ab4dc7f6c06b/kipulubekamodekoju.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/56924967807.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21E4F 17256 bytes
SHA-256: cd024618ab9e01dcb40a3b583f759886475b0c5fc87a9e8618e79045726fe03c
font_01_sfnt_off00023706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00024f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24F1D 11068 bytes
SHA-256: 1d6900a84f27c4d0620420e768d6126a5a09db8a7557c98b7a3499dc87e28373
font_03_sfnt_off00026845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26845 19576 bytes
SHA-256: e4245cf5a7feb7575e5b503fe700d7ec043a5591ae7d42022033452e19d7a576

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