Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0296ee0ffb55e0…

MALICIOUS

PDF

90.1 KB Created: 2021-07-22 23:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e06a9dc5a451ca5beee30d8dd17c1a9b SHA-1: 519ad3561c5486c46bdf70b67c7d6f98b232dabd SHA-256: 1f0296ee0ffb55e0ba218451bf8d5c8d46b6e1e6b84b3a72736f6ab530370607
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The file contains a link farm pointing to numerous URLs hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e11c8d7784---dajewapa.pdf In PDF document text
    • http://driver-jazda.pl/upload/file/69002339142.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160db0f89c5889---97202290001.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/mekedurutulolufebuwujez.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/9712424614.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/3714f36c220d7d9451fd753557e1812c/86828250660.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/tulajofemesiro.pdfIn PDF document text
    • http://iwishop.hu/file/jerikazezutos.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/97152604998.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f05020416ff---23983471272.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/fedujofugu.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/xokezopunixulewozi.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/23436463230.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/np96bnumnodopmv29j3rrb9knj/16285942567.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/98873373937.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca6c7848e0---46505133763.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a6e571fd058e4e2fd1013a4051ac4bb4/dijij.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ea1df64d17740783970eeba6bf8d7fe5/fibuzipiruxebiroka.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160811d08b7d68---2693360959.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/3628342142.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/fizutapomi.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070eb852ffb2---96238466945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=who+wrote+the+historical+books+of+the+biblePDF 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_off0000fb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 10640 bytes
SHA-256: 8e9c984a6df28940915cce9f19ffa5b6467b9e1b1ac3d3246e6105d6be48d554
font_01_sfnt_off0001141a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141A 17776 bytes
SHA-256: 23eb4e5e825811dc208fae5621a2b6733b6c9303805cfda21089daf0c93807a6
font_02_sfnt_off00014238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1