Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67d7bd1ce2d69b2…

MALICIOUS

PDF

85.3 KB Created: 2021-09-15 19:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 739d9e62ab4906f30b50a0a83a6d7336 SHA-1: 38a6ac3e355278682661d58ca01f6734ec349b3c SHA-256: f67d7bd1ce2d69b2de13b4cfd602a42f074ab42dbdbf0e1a5dad695d6a3374a4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to various PDF files hosted on potentially compromised or disposable domains. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://nwatchonline.org/userfiles/file/84928994024.pdf In PDF document text
    • http://synthecinter.com/userfiles/files/96541616656.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/vopowagur.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/gezosukimi.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/piledajiliralukadajizoz.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/0e578b83e0ecceb50775566e0d4c88ad/zexezubupexupifekuxuwirok.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/dokuzukiradevevamojora.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/0rgm979ijikpps7mum3o7kknv0/20024717552.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/kuwob.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce0aaef389---zumewereluta.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/84617024141.pdfIn PDF document text
    • https://limsurdua.com/contents/files/14845470366.pdfIn PDF document text
    • http://thegioioto.store/upload/files/soruvexidafenani.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/tisuvukij.pdfIn PDF document text
    • https://ccskin.com/geektic/files/mepimolujasafitez.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/74f8d070b713d1244125ef1bbbd4861c/sedovejuxivelasurebarav.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/mixugukemalipazewixepavu.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/31643372881.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109060358053110.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/83242088913.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/sebivimatexag.pdfIn PDF document text
    • https://tarsiman.ee/files/file/61104192095.pdfIn PDF document text
    • https://kildevangen.dk/files/8427395045.pdfIn PDF document text
    • https://egf.tw/test2/images/file/sizak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=igi+1+project+download+for+androidPDF 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_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 10844 bytes
SHA-256: 731115cd1afe6a6eb185d1087ea160623f180fcf51d234925ca75ed72d582e79
font_01_sfnt_off0000ff76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11788 18492 bytes
SHA-256: 3c48c9bce5808c8267e19700f2c4dba5a27aa5a97e1700fc5343103f4342ea9b

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