Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2f0976804a623e…

MALICIOUS

PDF

78.4 KB Created: 2021-08-29 03:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5cbaa29f57220b38c3ff00bb81f0157b SHA-1: 8f492bcb664c28fea78a55f39254ad5ef936a3e1 SHA-256: 5b2f0976804a623e6db8c11fc6758ad6846c6e7491da79378e5e81b1844ec01e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, including compromised WordPress sites and disposable hosting, which is a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://247hvac.ca/fabulous1/uploads/files/8787790658.pdf In PDF document text
    • https://tomorrowhubs.com/upload/users/files/61141730662.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/xezudejazigopib.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/44837053759.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/58613396683.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa824dd7c---14606101834.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b451687bf04---56580612371.pdfIn PDF document text
    • http://berbun.com/user_img/file/47649647608.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836996d7f3e---19935802286.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/ludijisozowoxabobudabal.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/xogirivuxedanomasi.pdfIn PDF document text
    • http://synphabase.ch/upload/file/fadosew.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/48570710146.pdfIn PDF document text
    • http://snsi.jp/image/news_file/60726024573.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/1960530845.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/vatativemalogexu.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/lozozufazogunesir.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/33005434256.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1917d0bb---42231220802.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///30025123382.pdfIn PDF document text
    • http://melvin.cz/data/55071939310.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/sexudununujut.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/9080f23644c069a030310fe9a3d71196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=learn+sight+readingPDF 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_off0000d19f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19F 16820 bytes
SHA-256: 151fe87b6cba95b4498afb77934436dbdb88a20d900b9494278c043f89cb406a
font_01_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C7 10316 bytes
SHA-256: 7e491c8d592ac30588f62280dc4a8db78c2f0ca987d96400522890719a27e1ce