Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9929c6ab17d540b…

MALICIOUS

PDF

72.1 KB Created: 2021-09-07 05:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e84d89ca9b09f6323f793fb7aed9c961 SHA-1: 929df82db170f3d0b7f307275c268d6686bd3edb SHA-256: f9929c6ab17d540bd64c3c556e0c027f4b101729f5a162e60aa079f7ce047c44
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 sites. Heuristics indicate this is a link farm designed to lure users to potentially malicious content. ClamAV and ML classifiers confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fad58b452---78352701721.pdf In PDF document text
    • http://area100impianti.it/userfiles/files/tonogadorenixejijimuxad.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/13628073449.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/dijopidexafin.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/76959449317.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/28570dcb9527598928dbc6262c8a9b25/89204659597.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/losifesawamumujubiraruxef.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073364c60f23---tumanemepugese.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/gakadigowodufawafumexuro.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/zulapelodivopibuxo.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/5bab3b1d14d49e2204c7322f61550aed/rufagerezenatimugumowodo.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/tuloropolusi.pdfIn PDF document text
    • https://lecachet.fr/docs/files/94746685043.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/tifugur.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/meparoxekom.pdfIn PDF document text
    • http://itena.si/uporabnik/file/53923477797.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d288f13d4b9122ba9f80b7a99c18a73c/gesowebataxirururusoka.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161055daaec00a---91189377234.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/63005827895.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210726_A4EABB798C807307.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51791061282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+write+precise+in+english+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_off0000b607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB607 10816 bytes
SHA-256: 2cfd6bd845c7e07533e4e74ebd8dfc59ab1410edc8bfb0467e5f3acc33cc9bc4
font_01_sfnt_off0000ceaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C1 17240 bytes
SHA-256: 51f366dfda0228f63178619374400ec0592a7a634d17c897621b0082521b4321

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