Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc5635449f0bc16…

MALICIOUS

PDF

93.3 KB Created: 2021-07-07 17:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73d63f846c688167f6b94b5dad844066 SHA-1: c5771ce6eccd22e04c4c39dc222375e80f20c61e SHA-256: 0bc5635449f0bc16757f2f0bc008be9356b9ad67755d35073230631163a7e001
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the structure and URL patterns suggest the document is designed to lure users into clicking through to potentially malicious or phishing destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/dd7e32be558e7bd62934b20c8c3512d9/85392335700.pdf
    • http://officinedesign.it/userfiles/files/64111284066.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077715d6dcc7---38291698178.pdf
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/depazifavutonemuko.pdf
    • http://danielbushreunion.com/clients/41596/File/wixubasasaborumokebode.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c595b47b4a4---didubek.pdf
    • http://musikpark-live.de/userfiles/file/jevisulelutapufaropito.pdf
    • https://capitalsyndic.com/userfiles/file/xovubud.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/5407e26a692ba7567c652947c5b73374/28202693974.pdf
    • http://sochisushi.nl/survey/userfiles/files/28827369834.pdf
    • http://zentrumok.com/userfile/files/luvokafefamokapik.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca38f1b7b4---23974056412.pdf
    • https://mojer.bg/files/30927473742.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/37baaa038d11deebb4ee3bd52f3d3c20/desumuvesukasakesuweda.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/7hba69883bpcqsoa7700pnkpnn/18143357993.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5723bb6679---romubonekapib.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b24c00c820---9593207138.pdf
    • https://chiataiec.com/userfiles/Proj_Name//files/24256578856.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6c3de5cbf298adb711361ffc3369367c/76377604404.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c0844849ecc9f688f82c26af32b0b976/20660310948.pdf
    • http://afghansolar.com/userfiles/file/wikagu.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b93c09444c582ae9f115ca23f5d71034/33445070517.pdf
    • http://cjatkinson.com/userimages/ronarimeneralutenurenasu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=aretha+franklin+backing+singers
    • 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_off00010a59.bin
a31c9c2251c2577b9f963f19306edc9e004f439768376877ccb11a8546576ffb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 17276 bytes
font_01_sfnt_off0001375c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1375C 16792 bytes
font_02_sfnt_off00014f73.bin
abb134d8880879f1d4b2f550833cbe19ab3fec88dedae051af4c0bc65f4914a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F73 10708 bytes