Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b88e88fd3f7a9b5…

MALICIOUS

PDF

101.4 KB Created: 2021-07-04 06:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bbe1796bdb83593c007d4444c0ba42c SHA-1: a63e2448f9ced50b87feb9a6b5f244c36c3c0247 SHA-256: 2b88e88fd3f7a9b5dd8acd9d5e6ae2bc913d1a70f45b69e994a4dbffb36a2cbb
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting it's designed to lead users to malicious content. The PDF's structure and the nature of the URLs indicate a link farm used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mattress-leader.com/media/lipagobasizenak.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/7e9089d8l79fc6fql0175aa0h6/96160975802.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160756ec4eb543---58560727619.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/68a5a13c4ea3273165c0bd3aece62834/24283408553.pdf
    • http://dermalab.pl/userfiles/file/jenokaxa.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcf541115---28226179101.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/2ecca9efb8189eca28a20f5b1f54024c/vunedejodugelodesetojox.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c72cc60afa4---37934809191.pdf
    • http://pulsarvn.com/media/ftp/file/81894636811.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e111d5fe9---37608459645.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/of7crfg6tmuibeucije1iogma8/wawisawelib.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/qqbnu4nr4834daq2m95ctka7vg/jemewozegudajaredanamabod.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19fe4f29af---24589015293.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609a555e08df6---jurob.pdf
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lafekigusezenurudeg.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52c3a98d3f---52003659536.pdf
    • https://spiuruguay.com/ckfinder/userfiles/files/xefoxajele.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad3c3dbd63---67008132126.pdf
    • http://cayxaotamphan.net/userfiles/image/file/nuzeburamijodipo.pdf
    • http://szakkepzosiklos.hu/upload/file/robudexeravude.pdf
    • https://cortemadera.com/wysiwygfiles/file/dufiwimimalixodunetu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=moon+sign+compatibility
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d4b.bin
331b15a8482d179cdce1f9a7cb44c96a2ddedafbfb0dae06557955255d5f5d7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4B 10732 bytes
font_01_sfnt_off000145cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x145CF 16792 bytes
font_02_sfnt_off00015de1.bin
0eab3fae3d5aaf71462ec50b95c5ac177189417c813fc2370fc3cd939a12637d
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DE1 16688 bytes