Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace8d5cc569274d3…

MALICIOUS

PDF

80.6 KB Created: 2021-09-02 13:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b14690a7e3a3155b5a36e222e546131c SHA-1: 8df7443577163a9ebe8e106356435d9037901c2c SHA-256: ace8d5cc569274d39efc898d30c258b7881ce67beb184ea080df1c1981bafc11
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 links, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to redirect users to malicious sites. No scripts were extracted, but the overall pattern is consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.allatpatikapecs.hu/images/file/soruli.pdf In PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607136a713963---93642707659.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/damupenojujerol.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a63ef3dba853334e19c9f61fbb310a86/befidojaxejituleri.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/gukutipuwemenoxupuni.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/89915a7199c3ff44ee9d765badc42363/zitenoloxatewi.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/zukewowezedugi.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/91646160122.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b490af9f1---pipilabelonajinugi.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/bunamulilade.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/cki60l1i9ageasm15tlukqr51l/20547503586.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/55364835068.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1a7695ac304a59aca514e6241904fa88/mifefuwuvagakixafaxesupaz.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9febdc26fe---tatolavi.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/8914110655.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/tu59dr28hh5vmvsd1lsspgr9r8/28996941037.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/mujixirola.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/roferukegunifefu.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611a390d8f0df---22357534558.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/wasabuberesokufunulol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=reliability+of+computer+systems+and+networks+pdfPDF 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_off0000d564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD564 16872 bytes
SHA-256: a8764ccc189677c49829e39037a9a5bc878862a51d00a437bfaf94e29e4c3834
font_01_sfnt_off0001015a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11971 11360 bytes
SHA-256: 25843d824a0c5a46f3097b9a2d2bfce08dbd2b384ad504cb029bfdcd15c875d9