Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce33d3445ffe5d16…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 13:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 85fc957bba90a1645f3e31e94af0a285 SHA-1: 54b2d7575619e9e064c1599de3fb2fecb0fbca48 SHA-256: ce33d3445ffe5d16332d41f759a49eca43f0714a4c993029df8dfc47c9249a12
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV and ML classifiers confirm its malicious nature, classifying it as a phishing trojan. The primary attack pattern involves luring users to external sites via malicious links.

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 https://www.bosingels.nl/ckfinder/userfiles/files/65339960395.pdf In PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0224c07b1a6635fd033fb3efd3f0565c/vebofaxadasafovofij.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae4fce391---62512661708.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210801115851.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/tarezuxogapovoxulasaxoko.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/patobizexarujipewon.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1627645428.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/wesosawoboxaniwe.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/totumusowavinofovafes.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/99611222846.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611844a22ba3b---vetotumatasogusewalolaw.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/57491067473.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/berazevizi.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/gitotalot.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e486282a7c87bfe3c0214636a4a483ed/42619345093.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105280255224988.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608572baebec8---91903008830.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/sutasalifukuporolex.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098dccbaae45---33820932139.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8712f08d7---jevowusofudaxupamafiv.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608928b9581de---jenodaxunufexu.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/js328h7sqgo26iemj72tlvm71d/suvivejuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=piaggio+mp3+250+service+manual+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_off0000df38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF38 11580 bytes
SHA-256: edcd6afe3f3ce7fcf7ca8e024dd609015309ae54ea44aa4ffbaa32670681abcb
font_01_sfnt_off0000fa8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 17536 bytes
SHA-256: 548e35ee112271533b88f4f7e66c7954702bb151705e86f0c8d6a93c1242f646
font_02_sfnt_off00012826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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