Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde819b7ba3189f5…

MALICIOUS

PDF

104.6 KB Created: 2021-06-30 10:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7f51e04c50ed78e4d0019fc0c5eef9b7 SHA-1: 16beef1918d41a8c85625f49f69468b4dfacd003 SHA-256: dde819b7ba3189f5e6a100755d0eb4d94bb9edbb4a15a7133dad1dd180e3b4fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, likely intended to host malicious payloads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic of using compromised infrastructure for distribution. While no scripts were explicitly extracted, the nature of the links suggests a potential for further exploitation or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9682

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 http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609121af3caeb---34775198980.pdf In PDF document text
    • http://bbfrontedelmare.com/userfiles/files/19820939074.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba206176a5f---56402201449.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1a3441d05dc9b5ba8fc81580752c445/depam.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/1nkn2l8mhu1jg7lj3pn2c40q1m/26608739498.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/d7b7cl2sobbmukjh16as0gok67/boxawebefebivenuxufuvi.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160944faa61794---53408777341.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a1325e89a---kuzebapomefu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8f1561462---95187028054.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/7801206236.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/275497418911624931650.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/30143907521.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/64462292380.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/h4uk6lchakn30l8fom4vn8h2lu/11975641577.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c601629fa7---68019604565.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608af9da27198---regigusasozifasup.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a9ef05e984a6a7180571651d759101ee/mekajavugewasarikesedop.pdfIn PDF document text
    • https://ivaco.it/file/13673945884.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///zexavodo.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14dcab3574---79949607928.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608028e8c8c44---28895447710.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/wesojuzujilenevugu.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/ladavagu.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aca91937759---56523906147.pdfIn PDF document text
    • http://myphamasia.net/upload/files/minukotowevevimezux.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/861c747eb699650f989b40a033a13dd4/jaxegenolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=maroon+5+animals+mp3+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 10708 bytes
SHA-256: 54d81a6b0857e64a353a0e926de59d5389f78b2ce1dfa9342cae19a13c7231d4
font_01_sfnt_off00012627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E39 20208 bytes
SHA-256: ad46985cf0bf70eea5ef5af8562c6561aee7eccd6d331df9fb760b84bf1efa64
font_03_sfnt_off000170ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170EF 20076 bytes
SHA-256: 96c3c8731bd0fae5023381acfc17adcc4d52e9e406279c96fcf7b18af43bd65e