Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0484ac287211c0…

MALICIOUS

PDF

101.8 KB Created: 2021-06-28 03:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17aff8f002726b763e375210639b900d SHA-1: 6ab9db74fe485f2f59dd0212dc5e5afb1097577a SHA-256: 8b0484ac287211c0e614b451d8226629d8263e23efb529a445aff900e1d6e3ec
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. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, suggesting it is used for phishing or distributing further malware. The presence of external URIs and link farms on disposable hosting further supports its role in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://queure.ru/uplcv?utm_term=nicknames+for+barry
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/8b5ba866c3c8c7afc495853562309d96/15361447093.pdf
    • http://wooshin.kr/uploaded/file/126300861860af79654a33a.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949e591453a---43363030305.pdf
    • http://nano-vip.com/ckfinder/userfiles/files/90519693007.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a35ed33da0c---31735878026.pdf
    • http://fd-health.com/upload/ckeditor/files/63277862878.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914b3e73324---bigebuwedufizamu.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b9b3c8652076d90fd8294bc8de1217f4/13793309728.pdf
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/81471313732.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e75ce3021079e232cbc7e232d199ca45/11738111002.pdf
    • http://zulassungsservice4you.de/bilder/file/jopojan.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ecb5a953---zidaxufobamegonuxot.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074671f6784d---9306265734.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5c782e6d9431db6484ccbc78ae9915f8/87422837205.pdf
    • https://yildizwebpaket.com/calisma2/files/uploads/najoboguzesavitoj.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/rodugaxomupuxusape.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607738faa35f2---jumalevu.pdf
    • http://sl-light.ru/design/img/upload/file/vedalagunipowixat.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27c4823d2f---49058809002.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/0f222f5fabcf686dd93f52d8f260a392/25201015406.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4300efe46---puximitifoman.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/vl9t9mu71rbsp8glenfq45l1v2/44725027127.pdf
    • https://anmoul.com/userfiles/file/jowatetor.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f04e.bin
3efd899ad6adf63b96e385edca8f485a98dac7271c4cc41939d372b99a64ad23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 21372 bytes
font_01_sfnt_off00012ae1.bin
0cdb45482f02ad2086094f8255354b5b7399ccf850abebc9e31a333059e11a38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE1 2116 bytes
font_02_sfnt_off0001347b.bin
27b733be78c44318c0c81218358223b9be10fd2637777912e0d499180fe1a397		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1347B 10676 bytes
font_03_sfnt_off00014cfd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFD 16792 bytes
font_04_sfnt_off0001650e.bin
8f580b62054ac86994248b867429ae7ce79cd5bbfc86f48400836405afcebde4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1650E 19920 bytes

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