Malicious PDF — malware analysis report

Static analysis result for SHA-256 6705bcb5c456668d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 11:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 633ae34473b421be9a5890417f10e25e SHA-1: ef6a0369f88a303630c022bea5c6e458689f6570 SHA-256: 6705bcb5c456668defb6a2c87b785a2730f3d3a716bb32969b3de24cd92d32bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on potentially compromised or disposable domains. These links likely serve as a lure to redirect users to malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://yodobashi-church.com/tigove.pdf In PDF document text
    • http://marmaraisg.com/images_upload/files/fezoluz.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/54153889636.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/38280283194.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/tukigubofoguvazusab.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/50405572275.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/mifoxefoxopovefavurirar.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/zimazana.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/feribifosetureze.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/27482076655.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/76303882125.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/1945012383.pdfIn PDF document text
    • http://websurin.net/UserFiles/File/bezidiwub.pdfIn PDF document text
    • http://imbirimbir.ru/files/suvemapibotiz.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/8nm3364blim83ttejk605cef7u/fudotubazufemebowisu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136790809673---33819699015.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/folavuji.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/gidodobugep.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/37122737118.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/judasorefib.pdfIn PDF document text
    • http://mp-journal.com/media/file/gebebiraz.pdfIn PDF document text
    • https://kapefashion.com/files/files/ginivonutidawivesibezuset.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130824f09d0b---16486856161.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/19401019420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=dream+league+soccer+2021+app+downloadPDF 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_off0000d887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD887 11148 bytes
SHA-256: cffcf41a45171eac000079ad68e73132afbfb6451d29442b8621e50e0b0ce2bc
font_01_sfnt_off0000f284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A96 17044 bytes
SHA-256: 20c9cb26a6d45bb13a3f30848dd446754b5673719688cfcdc23c2fe215709a1d