Malicious PDF — malware analysis report

Static analysis result for SHA-256 477d26f89ed3ea0d…

MALICIOUS

PDF

79.3 KB Created: 2021-09-15 22:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc3433f414bff9f76fef437f6fd28800 SHA-1: 3d71c2b431c72995def368465cb3181740974ffa SHA-256: 477d26f89ed3ea0d73b739b9f71def98675aca7736afef7aa8dc812f57e490cc
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vicc.huh.hu/UserFiles/File/17409217294.pdf In PDF document text
    • http://imosa.asia/uploads/files/202109040544274980.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/safuzawivi.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/0hme6jc1lvs5m08r9m54frrj2u/75760848426.pdfIn PDF document text
    • http://ortosprendimai.lt/userfiles/file/33737907663.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/68761881748.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca10910e7---10809820950.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/653db15b4c23864ad50a3f3c1268b444/45411988118.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ovgs0nkca9iberes8qvaeubvq3/kibuxegobumediwenem.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/54767430147.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/tuwupom.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/vuwepuju.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/nipujokumebovoxas.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-9-3/20210903123612385120.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8f7d25ed32cf589ab2b492e2b548249b/31668954343.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/semaburupidagego.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613132ec2a3df---69792793766.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/14861446081.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210907232903.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/20056183751.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/motefodewefamilaxefumanox.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/wanesekuletimozaxojalod.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/65104563618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pinball+arcade+unlocked+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_off0000cf2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 10576 bytes
SHA-256: 45f4d00d7f8f1767251fc011b4458ba760be0402fbeb8dc66f7f7ffc33b3c60a
font_02_sfnt_off0000ff32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF32 18908 bytes
SHA-256: bbf631e1b709cb92936ab61a118e47ced2bfdcda5357ab7738441ae504a42408

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