Malicious PDF — malware analysis report

Static analysis result for SHA-256 a464aef823b103a4…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 09:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6ba470ca327cdc5cef70f4de1d41acf2 SHA-1: d564ad87b335063f4d40471968d00a1d0dc3671d SHA-256: a464aef823b103a44fd7c162ecc4f3e440012bdbd1973e5a05bc52b8daac184c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/010c43d804ee2b9aa46e618f7f5c31de/jumilowipugusefuzi.pdf In PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/4896abb17da507ba84b598510eabbe78/marasugubez.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3d59366eb823d1d6f15514033f788b89/pirajudida.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/76990686193.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/61657366466.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd7eb662b3---xodinugobazade.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ade25a49562---famixixufovoviga.pdfIn PDF document text
    • http://coffee33.ru/archive/file/wapademizugatuw.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608445ddd31d8---tojutenesosusopevazadus.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/85139244413.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/vofunenagajil.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/47097764043.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d61f3e7f0---samavajagomofopafenuzexe.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611785a2b1e05---pizujesik.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ffdef50f74465a7c2c6f3a9f6e538669/48311007807.pdfIn PDF document text
    • http://biosite.ru/images/news/file/72233874389.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/72938928881.pdfIn PDF document text
    • http://esistore.be/userfiles/file/42933745978.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160f3f82527c96---vuzedagejibikubekiritijeb.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/podarulojeb.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/40935f107ccfc299511de6e025b50af8/zidowanulosediroliraxu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075c3d7c5f54---xedan.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/48805f993a1ebbef99d47c65a9277b97/25838847589.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/56244542464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ojo+humano+fisica+optica+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_off0000d4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 18424 bytes
SHA-256: feaba1dfb67ba2e1e04f2a29c12cc17da39310c782fc04bf124b788e0cd701fc
font_01_sfnt_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 10860 bytes
SHA-256: c99c997d850f56b0775cf532c2368bec81b53f078fd7d6b3da3f7b2b100204c9
font_02_sfnt_off00011b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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