Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc150948b012daa6…

MALICIOUS

PDF

93.5 KB Created: 2021-07-13 14:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e4ed10e93f1792d32e83bb92d615d88 SHA-1: 219c3ce4615175054baea84dbcd73a1922c4b865 SHA-256: dc150948b012daa6af33f17958221c17ca5eafaba5c43b00463cc7725f2c3396
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://sanruou.com/app/webroot/uploads/files/popumew.pdf In PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/4slcqp1gne3go3gqa0erp7odp1/83508750495.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/f50c484fcd12a1065a0a33c2b73cbf13/4193266959.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5cc122df1---13372025278.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/93365694115.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/panakoxezigiwegokovinuji.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/fobufalodugixatekofataw.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/49449707519.pdfIn PDF document text
    • http://progetec.org/userfiles/files/memidexigonakiguzobi.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/49664121255.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7aded826e5---2290071085.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b8522bb8e---daxilimabarus.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/juvuvovusagetu.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/r9e85rjf7l6ilq856khend4plo/silawu.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/vagurowapeja.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609877143fbd6---ranutowizunome.pdfIn PDF document text
    • http://klefmarken.se/upload/file/18417727836.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/0b02dbeaab0406f2728513400a5f0d48/39663523315.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/0e628bb6524cd505207ed4ba7ec09815/31800941316.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/dikoluma.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/duwawagene.pdfIn PDF document text
    • https://hirurgija.me//files/zirasixenajewazuvapepufa.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/19744703895.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-3/20210503152614143097.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/risibigemuvukutapata.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/mewudagokur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bcb58a6bc---buduzenetuburawod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=neutralization+of+naoh+and+h2so4PDF 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_off00010629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E40 10784 bytes
SHA-256: 056dfb5b5a5de8321b3dcb858672cf6a1f33313f706ed397d651de289abe939e
font_02_sfnt_off0001371d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371D 18448 bytes
SHA-256: efe6b1b6cdcd32fd336974f6936899b01cede0d8d3f331a63865c2a00050e993