Malicious PDF — malware analysis report

Static analysis result for SHA-256 22e64b098c6fc8cf…

MALICIOUS

PDF

82.9 KB Created: 2021-10-07 06:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: df373925507fe56615fa8d4ea8b924ad SHA-1: 600c2f78989cba210f6daac2f4e2c67aa86a2f9b SHA-256: 22e64b098c6fc8cffe3c0d119a456c2502996c5e2913bbf50a30284a03869030
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to distribute further malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The presence of embedded URLs and the nature of the links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://smidgel.ru/uplcv?utm_term=usa+network+fios+channel PDF link annotation
    • http://foto-preiss.at/upload_files/files/guromipod.pdfIn PDF document text
    • https://krishnacock.com/userfiles/file/wesagoxobowuraxufe.pdfIn PDF document text
    • http://stisk.com/file/kitamimabefopukof.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/relugo.pdfIn PDF document text
    • https://empresa-venta.hr/files/mikesexinut.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1615cfbc333f80---nesifejabafavebebobojor.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/toxufi.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/gawuwejowok.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/lobanigewe.pdfIn PDF document text
    • http://master-vin.ru/files/file/31129873807.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87f948ffb3fd417cb92bcb13828a1565/pidapurim.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/13202899233.pdfIn PDF document text
    • http://grandfiltr.com/files/file/foragiba.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/gezugog.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/sojusisagurawujeboduji.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f91e0371a20b9e2ade7509035ed81f3a/72726721259.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/jowikebe.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/vexosegisajanot.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/vimapuw.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/35850544939.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/rimesa.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/jesugir.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/sijepijakafoxigisogofosug.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/wakusajofusijezoreberot.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/8239062854.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/vowigajivelekape.pdfIn PDF document text
    • 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_off0000e154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE154 10616 bytes
SHA-256: 6e16f8ca158d0d1ab83445bb6078e1427ac157939ae937c0239ef5fde705943a
font_01_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 16980 bytes
SHA-256: c0d7618118dc916f72b65986d08a033b4c8286e6416d8aa4b71b0b113db34644
font_02_sfnt_off000125f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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