Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc3f62cdb58fbbd…

MALICIOUS

PDF

69.4 KB Created: 2021-10-02 23:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b55b1ff9c5a5dace2075e507e46b663e SHA-1: 96128ee8b075806629a47a48c720d73d0e9f3ebb SHA-256: 8fc3f62cdb58fbbd2ebdd4e98074188d1243590fb82f5231d554fd5c1627ecf1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and numerous external links. Heuristics indicate it uses a screenshot to hide a clickable button, a common tactic to trick users into clicking malicious URLs. The embedded links point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://dalaichau.com/files/39975209997.pdf In PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/jolupijotof.pdfIn PDF document text
    • https://interconformity.ro/images/file/dekelodetodi.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40904661338.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/fb7afa20982dc46e9aabcd28e2cebdd5/kofafejumifesej.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/7566826534.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/kurusejazo.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/laxegowusagidinasiv.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210912142756.pdfIn PDF document text
    • http://santabruna.cl/upload/file/8058296436.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/4635266815.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/hbsm0k82bs3n69klss20o0q014/bigiragigulosorakob.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/28864861268.pdfIn PDF document text
    • https://ambalatender.com/upload/files/73913962496.pdfIn PDF document text
    • http://lifeisartfoundation.org/sites/default/files/images/userfiles/file/63415258656.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-8/20210908020601104897.pdfIn PDF document text
    • https://niceppl.com/images/file/jibupirezusuvezixixi.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/nejezuwibozeferuduket.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/73622218616.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/76352779701.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/49274083015.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d28df58ffe---nesogexogezunupajosed.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/76185123237.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/lemogaveduxit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=disc+priest+shadowlandsPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/nizoxek.pdfIn PDF document text
    • 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_off0000b420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB420 14072 bytes
SHA-256: fe05867b24caa96d9303921689c6d18045c2cfcda69961d64744c9a19f6d2e8a
font_01_sfnt_off0000d70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70D 10696 bytes
SHA-256: 2e5aa0466cbfcd85e9662a119f5bf6c4114f6e3534492e106083238df2718b17
font_02_sfnt_off0000ef9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1