Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d69db9e89522e1d…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 07:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 63a6ad98f904795904d427582ae48163 SHA-1: b6dfbe097de2e270737efd4a02ef78a507575bd4 SHA-256: 8d69db9e89522e1d539c9d9f8f7fc1b58b01cf97e493cb3901144f90cdea0122
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. This pattern suggests an attempt to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://changrung.com/ckfinder/userfiles/files/wusimexewan.pdf In PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-12/20210912163522789564.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/xopuruvapef.pdfIn PDF document text
    • http://kbchina.de/upload/26608315537.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/82686167223.pdfIn PDF document text
    • https://jin-ji.com/upload/files/pelaxotexojoveli.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/paduxefemugejor.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/amutnqb8nj61c9usq398il11q1/96204602364.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/97042592852.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/bigezemomukeradubija.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/lewuj.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jitikiwetifijaxi.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/riwoxu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138891f22725---galazadafizolubad.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/84347476981.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139d90c24741---11225856905.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/jajunawuruwowaratagina.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/mivogiduritadakonone.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/malutolal.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/pemiwirupugomomopen.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36311260748.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/wawusot.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/zewifinevesozujotojeruxob.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/gulijevirexod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=zip+extract+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_off0000d0e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E2 20488 bytes
SHA-256: 65105d8591e4be9997538e69d76cc6aa027fabef728e3430e696b9dc01ff8bd6
font_01_sfnt_off00010620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 10088 bytes
SHA-256: a26d6c5db394a343a742a981fc502f2af896184d4fbf6bbb735bd7017313eb7b

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