Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee5f34bf6a1bc3b…

MALICIOUS

PDF

86.0 KB Created: 2021-06-28 11:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf09f1431accdde2da102d338dc4de06 SHA-1: 2e3c46bb3ff12efb57de92b152ad1ed6b4b1f95d SHA-256: dee5f34bf6a1bc3b5ab6d2f99bc52084a52a7cf14788950f0e7cfec83111c092
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve to redirect users to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://katyababash.com/images/uploads/file/83310124510.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/gaxadogezake.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67fede77e7---24474929554.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/jupodajeviguvur.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/fmi4o0q12logrignofikt8qk84/todusawopofedexutu.pdf
    • http://scholl2021.com/clients/1/19/19bca4f76d5065ca3bffbfc1c67e7925/File/67571761213.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072605b685c0---bugaxagu.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/7dfde16530cb10271e80c13a4a7b2ca8/31465093101.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/8c4c30c45ee229b1a86646777335dd6a/gosuli.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c68143e2b---kudezarukafekakudov.pdf
    • http://kapli74.ru/upload_picture/dizudiz.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/texaded.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2c9e82e6a---65857324963.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/5dl32vi6hujiji3o22supsrbh0/zuwufojebek.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/95663f3a26f8f65561932e56492ecfa0/66345812659.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bbk4avs6ji6ddpv22bdea1see3/butubujiwenatazeno.pdf
    • https://accuratesearch.com/userfiles/file/rulejide.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607215f321e84---bizevalok.pdf
    • https://codecs.ro/images/file/79598881586.pdf
    • http://kpdb.org/userfiles/files/fowusonakukutuvotibawugig.pdf
    • https://adasms.fr/userfiles/file/wuvujolemafimizigaxi.pdf
    • http://anhbanglaw.com/userfiles/file/21399976163.pdf
    • http://zhengfutz.com/v15/Upload/file/20216132048315591.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=high+pcv+in+blood
    • 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_off0000ecfa.bin
61e210db0e61a37a117d3f67120bfecec172b120bc32bca802c8b005c5807de0
pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 17384 bytes
font_01_sfnt_off00011ab6.bin
27eaa5c0ec5cd37a63d88f1c16ecac8738cbfcd2b3c7ba7a8ba57f03c0fca501
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB6 10332 bytes
font_02_sfnt_off0001315c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1315C 16792 bytes