Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc864b4a7deb613…

MALICIOUS

PDF

91.7 KB Created: 2021-07-25 03:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5d0cc7d3c21af8b8609050896e62486b SHA-1: c389c015c0f0bf1214c6fecbd9791a825172f9e1 SHA-256: 7dc864b4a7deb6131bacce2b05b905e42db4229d864f832847454cd7698f9005
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. The PDF contains a link farm pointing to multiple websites, some of which appear to be compromised WordPress sites, suggesting an attempt to host or distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8770eb13a---23939538233.pdf In PDF document text
    • https://prtl.pl/userfiles/file/61706693284.pdfIn PDF document text
    • http://capital96.com/userfiles/file/pasurafupoluwejosivadixi.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5cdaa5e6d9ba4753191e8d8e8607140e/14616436334.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/74ef1116cf793c712e1eb55b11da980a/jexibe.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/86497959880.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/3kdt00b3flniird93rj6cov0ai/bagelatisajuxe.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/3271099750d4bfa81fc2b67be5596048/74169617660.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0tb9uuselukk9s12poei1npl92/86350350469.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/jb0qetbc6jq9eg5orv5uhno37j/ninikewukuzojalok.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a6e9e761---57157502352.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/lolaj.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/1436331973.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/netakilarumurojoxevopo.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/tapubiwugis.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a2efae46a---jibijoka.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/m12krjfa7nqjhsnbevngm82u91/risilezowumesomegorexape.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/91466653611.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/fufexufutakigozanitadawu.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/puvip.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160adc384b156d---tipiwigowuvigikoxiwofepu.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/26525866564.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/er081tq213fbr2ulurker3i02l/wofesowafirewijijufek.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1626431518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=vmware+player+portable+windows+7+64+bit+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_off000101a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A9 16932 bytes
SHA-256: 6ba54984dd9b448ab7ed6c1ce9c0ecd001c93a49883c3419d5a51ec5ab3e7e18
font_01_sfnt_off00012db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CF 11156 bytes
SHA-256: 21e7fea9f4d59218969784970212fe7d9df9944e46c8b9d6b9737645ee249871

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