Malicious PDF — malware analysis report

Static analysis result for SHA-256 76aae83f5e33c691…

MALICIOUS

PDF

86.7 KB Created: 2021-06-27 02:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bea7e8c146e57d3f5cc22b9bc329108 SHA-1: 8c1680ba12d08f81aaf72fc6c1b78c8a2112590f SHA-256: 76aae83f5e33c691d2b336b6012037e7a0f0a38ea71050cc858292b2d23612db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external websites, with several links pointing to compromised WordPress upload storage. The primary attack pattern involves luring users to potentially malicious sites through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pallenberg-busreisen.de/uploads/files/wafibaloperokogaje.pdf
    • https://bwawarszawa.pl/upload/file/70374853577.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a45a93f2b77---dafaxoleju.pdf
    • https://beauti-full.ru/uploads/files/12182016332.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e9ba7ce3c---36973470191.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-1/20210501150107503031.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/75c37dc77395fb98cb0abedafe291177/18009333946.pdf
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/21457779851.pdf
    • http://rhodeislandalpha.com/clients/56223/File/vewokitovapisexonunebi.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806aff09dd3---lijitirurew.pdf
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/kodizonitevirajonoke.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609886e695a26---zamomapotiwiter.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7ef896a4---9696726480.pdf
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/3905a4514c6af7ce902e1533a0ba8f4f/50735864737.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/kep8a9r4hpgu7sgastp7sdi962/85692454954.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/rpkftau53jrnrg0tj9knh4k6vb/88317282793.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/waxigoj.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba37aac8f5---81360370522.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160848d7ec669c---rajapasawate.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bef55b697d1---34460184658.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a10e7b3732a---17554707816.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2472726eb8---23865706386.pdf
    • https://hospvetcentral.pt/site/upload/file/64335871937.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=in+consistency+with+meaning
    • 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_off0000eb45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB45 16792 bytes
font_01_sfnt_off00010357.bin
32412095367f000b27250896f8ec00275baa7a5fccf9602fe9bfe68c134a65af
pdf-font-stream PDF embedded font (sfnt) at offset 0x10357 18548 bytes
font_02_sfnt_off000133c8.bin
1904266fabc126d92cbabfafd650b200fb5fd0b180c6271d1d127f5f1139d553
pdf-font-stream PDF embedded font (sfnt) at offset 0x133C8 10684 bytes