Malicious PDF — malware analysis report

Static analysis result for SHA-256 82860055d55718b2…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 13:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8c63c73195339593538af1abdd227433 SHA-1: f2f0dde7392ddcecafcd38174d332013df5c8002 SHA-256: 82860055d55718b28ce8126c887085f89ba6d4557f57d6e8d073823ba7203ebf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to link farms on disposable hosting. One such link farm is hosted on compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution, disguised as a YouTube app download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ego-sofa.tw/uploads/files/202109010902476026.pdf In PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c91f90e08---67167067885.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161328bb2c12b0---xunupenalonetovam.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/pamapepezolevegujem.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/83596677294.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210904011548.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/12060489273.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/fulajuvenipebuser.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/8585249691.pdfIn PDF document text
    • https://projetovm.com/uploads/files/gigomiv.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/vutibonuvija.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/tajedafiret.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/95694926024.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210915235911.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/48980787454.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/9853888527.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/62632879353.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/jijabutapelogubi.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/mixinudope.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/62657766133.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/bawenuwajenunuj.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/pkqj6j9l02a3idfmo1748mf54k/vidus.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/7875096551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=youtube+app+free+download+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC994 10632 bytes
SHA-256: b7479d528992020fa5a8b51580843988efc3ca1c2cfbca89542de0831a3f3c02
font_02_sfnt_off0000e1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 14676 bytes
SHA-256: 544018298a60275a4528b5dbb67fc655aa07fcea62353a75a5f6f0816f837b59