Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ee776b8878a734…

MALICIOUS

PDF

85.6 KB Created: 2021-09-09 04:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 33ee42f1d1df9cbd045d79bce9f84ff6 SHA-1: 2f71b9d6fc4e8e02c60b48b242353aaa945350b8 SHA-256: 66ee776b8878a734375e260f8626a054b16e181d46d574e4dd8ba3b242aebb4d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, suggesting a lure to download further malicious content. 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. No scripts were extracted, but the presence of multiple URLs on compromised domains and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • 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://szjg.hu/images/file/61921468862.pdf In PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/polekeduvo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613341f6b07fa---85220720601.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/sivuwiwi.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/58211580871.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/kavabojawomeguvevorowu.pdfIn PDF document text
    • http://contua.org/userfiles/file/kisewivijopevelagedaxa.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/barotolenovivomeperaxe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f3e1e94e0---bofexurupa.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/17012927967.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/17876361052.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/1350194847.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/temegu.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/vivopisa.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/dovefoti.pdfIn PDF document text
    • https://kawanmto.com/contents/files/69801981130.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/juduj.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/12899682413.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/38220447087.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/ziruv.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/s66dnfmgtaqfbdj8nk6pjrpvr0/34618629821.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/gabowoziposagovubek.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/96293949037.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/16354753226132fd60d18f6.pdfIn PDF document text
    • https://olterus.com/contents/files/kizarerexipev.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/1uftq4hbf5g0iqmifcc0gf1gr3/nikosonovikoguzotavizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=unzip+android+freePDF 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_off0000e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 19784 bytes
SHA-256: 7689a503a0e1540576e0cfe0bd59aed47d07b2a6541c4b0b07729e5ceafd0db3
font_02_sfnt_off00013140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13140 10244 bytes
SHA-256: f23d3ab32b8c6ae454f18724af5aef4f3b54ed5287012133ac6450f33f3385ab

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