Malicious PDF — malware analysis report

Static analysis result for SHA-256 10aff143f6853548…

MALICIOUS

PDF

83.9 KB Created: 2021-09-15 15:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9eea7e7ffb8d0b30ea49586237b1b200 SHA-1: 0820409f87fdf491fd38c729dc1667fabd91b3ca SHA-256: 10aff143f6853548c7915f382ab287c1b7ef74aea7cf4f4dd3543b81cd256d6a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains links to other PDFs hosted on compromised CMS uploads and disposable domains. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/61c45c9ed97b0aa2ae500ef8fe4025bb/mimebewojorulidab.pdf In PDF document text
    • http://prosquash.by/data/33057688738.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/wubaj.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/jogegerebegekajuzawezij.pdfIn PDF document text
    • http://cl-pub.com/files/files/63243939551.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/85889481452.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/mametad.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/16544559027.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/21258860583.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/tc6srd95c7cvq4vfkl7rdcpf7h/basilulilunalefinemef.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/jemudetubutexonilegoki.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/zepemuxadusewetagibif.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/5821385188.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613636dc368d3---61260452333.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/ziwexamejoxukobevosoxodaf.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/99614378478.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/fezowivitedumu.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/24785075046.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/gepom.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e47376caa2---fewesepabos.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/pikarowuvebalukexilerom.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/22715772060.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/5030928519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=new+version+telegramPDF 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_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 18396 bytes
SHA-256: 38a04a3d01bfe0b81a5dd4e930a0c4aeb865b23cec22438ec80c1bf91fe0f350
font_02_sfnt_off00012992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12992 10580 bytes
SHA-256: be1d28d5ef1da376def01878832207dfb1bbedfb9afd9cdcadaf75f088ae0173

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