Malicious PDF — malware analysis report

Static analysis result for SHA-256 114f7b90196210d1…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 00:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e28e0160112c025b47f89ba4aa79af9c SHA-1: 9637a96e078fe8a77738d0628d53b533bcd8f299 SHA-256: 114f7b90196210d1b4d7b42cbb905b571c85a9eebd1c28d62fcf26d1457a8b8e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised or disposable domains hosting PDF files. These links, such as http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c1428b97---45869748905.pdf, are likely intended to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://classicalgardenornaments.com/uplds/file/58464814597.pdf In PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/zumusegatiselafebijoru.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/vimiza.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/lifonogiwumugebusazumepeg.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/rijezipodejixatusut.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/86049318574.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/ess7ecbqi1pchq6k7b6g80kffj/47769793706.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/29689148497.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/kuxizabomadekoliguxo.pdfIn PDF document text
    • http://gerocuki.hu/user/file/lunovekikaro.pdfIn PDF document text
    • http://espokebar.com/uploads/files/52259032600.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde2e7b6e0---4006610661.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/66836935008.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c1428b97---45869748905.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/41518256857.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c73d510fbf---35371310618.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/78384621294.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/linifod.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/razivajobewag.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/42921869243.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/gususafobunavag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gba+emulator+android+apkPDF 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_off0000af7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7A 20144 bytes
SHA-256: 6dc4325dbcc81e6764347ee17c54db4f9512017d7a0156001676deebe1407241
font_01_sfnt_off0000e2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E3 10756 bytes
SHA-256: 77b0ad87ac2b9e3055c5970ad9a34d1651b7cd16c0015ddea48ed3cab481bbbf
font_02_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1