Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c9f76ee22b6dc0…

MALICIOUS

PDF

87.4 KB Created: 2021-07-19 19:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 912bfa4e0b8af63258c58406629dbae1 SHA-1: 684f25bf37076fc22c5dd22a19d649732aac9a2f SHA-256: 81c9f76ee22b6dc023592295cbe7a55c2a5de61411c85470921ebbda64bcfca8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://adams-gold.ru/archive/image/file/girisumaxekebilaru.pdf
    • http://nelly-design.ru/upload/files/22740213640.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160ede533370f1---80967269152.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d064dbc29---74630935762.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/177cf9f6d4c5d3653774a59ade333658/goguvajusagogumupopazad.pdf
    • https://aprilboya.com/userfiles/file/72641622047.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/5ded70402f248bfdc011a0d29cfece87/22526242388.pdf
    • http://bpabv.nl/uploadfiles/file/muvuzojer.pdf
    • http://komputerzagrosze.pl/userfiles/file/nesudilovebidosef.pdf
    • http://polipadel.com/userfiles/file/95611155071.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/2671110365.pdf
    • https://rijst.nu/userfiles/file/47758658394.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/e09ac6eb3787d741c9b3535fe518174c/zosizuriwepuragovijifago.pdf
    • http://dok-vo.ru/userfiles/file/tutuwelisariwurib.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/39b95b9e600c638aee482e44c3b79f4d/vokiladuxuvez.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/15797749073.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/72e813ab885f754f2e9ac3d804e28765/58683050321.pdf
    • http://cristalensi.com/public/File/lerevilibelaminajapize.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/0bc1919b6eccac007520dc36f88ea1cb/jimuze.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/885ivh9r824dmh0vsat7f56d1c/38872522301.pdf
    • http://pune-india.info/userfiles/file/93601085903.pdf
    • https://all-new-wow.com/upload/files/gorasijipowabalupo.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/dd900efafadd719d25cff1c66b89888b/funogapevufifitib.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608822ded0717---nusalorijogujuje.pdf
    • http://baigeleather.com/userfiles/file/64125090988.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c660c5948e5---xixunatorup.pdf
    • http://uni-farm.pl/ckfinder/userfiles/files/venilun.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607577c72a0bd---74681912495.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=free+logo+animation+template
    • 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_off0000f23a.bin
227a04eeb72383515afc5b9f9bf26e6d5d06ece437ddca130c37aad03124a34c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 10404 bytes
font_01_sfnt_off000109ad.bin
e0229e3040a4a7b965704863144215bbdbac0cbec88d98a7d4902987146525d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 18340 bytes
font_02_sfnt_off00013839.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13839 16792 bytes