Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4626929908bd0f7…

MALICIOUS

PDF

80.3 KB Created: 2021-10-29 17:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c85a109e8d532e93a7d3a1546d01fdd4 SHA-1: a777ff31f4f9637f28f14f2941085d9f13046484 SHA-256: c4626929908bd0f71d05521c6eaeb6801bbb97e29e2dac980bf580a0dff47382
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress installations or disposable domains. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://savaksangida.com/resimler/files/bukamegegut.pdf In PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/88613307205.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/2a85f04eedf83597073a4d289fb560b7/nezotelurikagivod.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16138ada1c00ac---67209125463.pdfIn PDF document text
    • http://unseretochter.ch/images/file/19241329602.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/xekasode.pdfIn PDF document text
    • http://bankerz.in/qpic/files/wedudesowabadososasolomev.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/9918024732.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/jujuxonuz.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/84900024021.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1617a4cf608659---xekojiropanamakedam.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/fozogoneguzakejugofovi.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/zanamojaledegiwuj.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/74104534938.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/gesenezoxupuxor.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/46098736280.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/zexowujenutizesotig.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e16e894d4e---segepo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1617182fbac613---46105398194.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20211016123423.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/98546332280.pdfIn PDF document text
    • http://balony.dmuchance.eu/userfiles/file/19546692470.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/6Zflnl449io/uplcv?utm_term=take+into+action+meaningPDF 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_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 10312 bytes
SHA-256: dc56f787422fdcc14734c2e59dcf9661ba46249f07f82d5a393ec211ffe488a7
font_01_sfnt_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 17428 bytes
SHA-256: 23b8833d3573f43271ec4e8fbe7ba760e0d98364ff90c11599952b2ae07fd64f
font_02_sfnt_off00011bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1