Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6703917a05479ce…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 11:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 449702fdac0e9151702447da9ff7f12c SHA-1: 8312aef24323669b5191cbbd30dc0f492b73f1d4 SHA-256: d6703917a05479ce620ef8e55ebcd07c1bf1a5cd4d242496ff800a39bef8c5e0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://adria-ex.com/images/blog/file/83468656241.pdf In PDF document text
    • http://jiehuist.com/userfiles/files/xagixinorur.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/87007412907.pdfIn PDF document text
    • http://heizler.hu/files/file/jegoxipiladexulefugufowe.pdfIn PDF document text
    • http://ktcz.eu/files/files/85537410145.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/37727674023.pdfIn PDF document text
    • http://sinostandards.net/upload/files/53468377013.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-6/20210906093700629452.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/76723090125.pdfIn PDF document text
    • https://mimpishio.com/contents/files/sulufazesomofanizulifovos.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/bujitajaz.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/89925161161.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/jeradeweber.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/33118398515.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385f0222669---25199405776.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/11868a6bf1d0728485f63455c2628a6f/39246451432.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/76544180948.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c5d630d71b8cff5f75d691d2c32911a9/50000036867.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/4666165922.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/fab9a7b72c913ab3f5398d62301f3dc9/70687184619.pdfIn PDF document text
    • https://hirurgija.me/files/20390313626.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/rijuremubejalarav.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613396d610559---7653810443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=beauty+and+the+beast+movie+torrentPDF 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_off0000d2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D0 17540 bytes
SHA-256: 94f4c12dca52ed5d69506337ce7a54af7ec686808b504155cee2085cb6239161
font_01_sfnt_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 10940 bytes
SHA-256: a0266b018a851e5d0fa98038c4155f3efaab627011976f8dc698a65f1386b8db
font_02_sfnt_off000119a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1