Malicious PDF — malware analysis report

Static analysis result for SHA-256 698ab73cfd8b84e4…

MALICIOUS

PDF

85.4 KB Created: 2021-07-01 12:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b8063c9bd66055fa17cfb3609f824bb SHA-1: a7fb1dee565d35ff29e052d9c7981dfa33be46bc SHA-256: 698ab73cfd8b84e45605b4bb131c0dbf92f79ec6fa6571e9c557b0ba6e95f803
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/8tp0vpbb68kvbmnev001r2b83v/88145656062.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0e9693918a9ad9cb521885cb28ba94c5/madidunak.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3dbbe4f7b4---kabepizavumuwosuj.pdf
    • http://wittlich-luexem.de/userfiles/file/rilixolowodivazaxerijolo.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f2ae2b68---34976445097.pdf
    • https://epiphanych.com/images/file/96180242584.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d6a1aa28d---vekukipalokidenuranazoxun.pdf
    • http://heibldr.hu/FCKfeltoltott/file/80050198784.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fc1fc7907---32628213946.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/m6qrq2lvf06hsfubo2cepv7lm6/17808853689.pdf
    • https://matrainagycsalados.hu/userfiles/file/mibekuferojovabape.pdf
    • http://www.donboscovizag.org/images/files/11956103784.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/398148fec645fd3ead25b1303bd4b41b/79592112981.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/surofalosuberovulonojok.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5565941845---81978646261.pdf
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210624123847.pdf
    • http://s-moonlight.com/CKEdit/upload/files/35678083427.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/0hasn0bkm4n00sc2qcl5qk70j2/zonopudab.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608bea23f2206---bebufiburav.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/2a2sccalpf52r4c0gg4ojtkljh/kezares.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfbc25eb7---34092464439.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6078d5323---tikedexiguwopuzu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=school+environment+and+academic+achievement+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_off0000ebab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 16792 bytes
font_01_sfnt_off000103c2.bin
6457ef9981af18b6deab566153455272301debd0832a961e53e08a1f34e66198
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 10860 bytes
font_02_sfnt_off00011ca7.bin
c4e754899c79399b330457fc56c8f7c36ecb9472e8123057e5065478255dc03c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA7 16828 bytes