Malicious PDF — malware analysis report

Static analysis result for SHA-256 8178769159ba2a02…

MALICIOUS

PDF

86.1 KB Created: 2021-06-29 05:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f559b504f1c5e6ad59bef2f379a1f89f SHA-1: 80b14ec232923fc3a66b7c45e2dff577a5348173 SHA-256: 8178769159ba2a02c08e2dfc1f0aec6f10162b8f8adfd8a24f3c31a8405d360b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://nomylo.ru/uplcv?utm_term=clear+messages+on+instagram
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bd546f2a27d---kekod.pdf
    • https://khanikango.in/file/joviz.pdf
    • https://foundryindia.org/userfiles/file/85383808687.pdf
    • https://martensmgt.com/business_school/uploads/file/67243373822.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5095da5dbd---73926958750.pdf
    • http://www.odnpoznan.pl/fotki/file/file/42842114191.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/e00bd511afe922f55b25ee14c88decea/bufuvidasubede.pdf
    • https://ecoretras.com/file/josiporeveravokisuxujatoj.pdf
    • http://www.pzkexie.com/up_files/file/63681188513.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077af83e3ef2---zavitegoliperabewesoj.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/mozadaj.pdf
    • https://beruanglucu.com/contents//files/55836320475.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad23c9997c8---fatukefatajinekumurogor.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5d200769---gitibaj.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c8d51ea3a---sogetarud.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea11919555---99854086526.pdf
    • http://naturallabs.de/userfiles/file/vuxuweniwapoxilefi.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb0ce76a92---femuninerazoxavax.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5368cd9168---72779247675.pdf
    • http://khanaphatgroup.com/UserFiles/file/4269888810.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/2ce2d09608f5d1f4640ea31fbfd6d2f9/70495940319.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xebudarivaxupu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079636bb1656---71988605106.pdf
    • https://sweetburden.com/upload/users/files/87612562661.pdf
    • 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_off0000ef5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 16792 bytes
font_01_sfnt_off00010770.bin
56d1e52ca2929eeb94a8a82887e70ba88e91b2484774bd75979a7a6b7023af93
pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 16920 bytes
font_02_sfnt_off0001337d.bin
959e93e1a86cc4ef016884206adaf2dfa3e398d79413006f13ab8c39d11311ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x1337D 10484 bytes