Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ed7d910f57a89c…

MALICIOUS

PDF

92.1 KB Created: 2021-06-27 00:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b848ab121158e836558a00d2ed60d7e8 SHA-1: 216240f600eef1c3c549ba2c298b17546126c712 SHA-256: 82ed7d910f57a89c37a70032b8df2d5f5bc1e6b20bc182ff7abc78f0ffa651da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cukiernia-waltar.pl/qcms/userfiles/file/xexetejul.pdf In PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef73229965---temejisapomemivejuwawo.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608342042e45e---44367698064.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7c4189901---82380984553.pdfIn PDF document text
    • http://bakoca.hu/files/file/zegojozefugefuvibaxitake.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2d627d88b---65309969733.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fcf268c9---4784378668.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/51421257314.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e4dc13314---55591305622.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/46273887796.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/80796752442.pdfIn PDF document text
    • https://lemanssrl.it/file/18340134774.pdfIn PDF document text
    • http://rld-carbon.ru/file/81408575043.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/eg4eiolop452d59g7burda8jf6/64244947368.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/nujutolegonobexezejozoga.pdfIn PDF document text
    • https://medtek.vn/storage/file/24490556911.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b731a4ce237---dapofufeda.pdfIn PDF document text
    • https://artbynela.com/uploads/file/70407165565.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54b26a4fcb---luzaxiv.pdfIn PDF document text
    • http://sushi-belovo.ru/files/gofodutigoko.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/80c9266ddf48d817d94c56f02cd8a2e1/94655604683.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/zuxurani.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/punibuwuzudorebatinu.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b48686a89ba---lefivoripugudedafuzux.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/16995105650.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=rogers+technology+adoption+curvePDF 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_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B17 17160 bytes
SHA-256: ac91f781d95730ea58b7ac474b8ad1647a67bd819b8c08e6907cdbfb06b10616
font_02_sfnt_off0001479f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1479F 11120 bytes
SHA-256: b63bf3946636a0a478abf73f91a5ebf4b89206834fa71d3fdd2b240ae9fb08e9

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