Malicious PDF — malware analysis report

Static analysis result for SHA-256 8810e6da629e6870…

MALICIOUS

PDF

70.5 KB Created: 2021-09-12 01:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16cfb7ab095b96d1e5c78cd596ae0c7a SHA-1: ab0512ecfb6d5f608fc4f8401e0637a4acadc677 SHA-256: 8810e6da629e68700c96936f8e1a9e45a24430845605264059ae7b6440d1a5e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://investmentskillsgroup.com/images/userfiles/file/87605099399.pdf In PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba0e24e41---92018755599.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161327fc57e942---94736705233.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/tofaveniwiragisidukuz.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/89157392815.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/wenevetomoxupinumimej.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/vametumomabopapof.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/38188025647.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210911151225.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/dobunoragizalejetolibulax.pdfIn PDF document text
    • https://sitarasign.ir/data/file/boluvod.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161344f9e9d257---69746124894.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/80697782995.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/fajoradefolixegelodoseji.pdfIn PDF document text
    • https://gangnampools.com/contents/files/xinevekate.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/jodumubalalevadegapano.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/63844228761.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/xokokesij.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/94022880387.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/lavuduzurekas.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/68991614048.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/72355397333.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/mirivifidumel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mandingo+warrior+book+pdfPDF 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_off0000b1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0D 10540 bytes
SHA-256: e4be2f7e738e03fd492f4b0e49736678fb427f0a623008d85cda34e5850b9fe2
font_02_sfnt_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 16892 bytes
SHA-256: feba259617c45ea0c4d7f6fefabfdfe59781d052588c7ae59796466db0ad5cba

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