Malicious PDF — malware analysis report

Static analysis result for SHA-256 aedda21ce8a9d8e9…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 06:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: db261e0a1cb286440c636e0f84eda516 SHA-1: 7db795d22be00b8e148d9e9a9f6972aad846618c SHA-256: aedda21ce8a9d8e9709a2a8b76aac3bdb32447c7c962dcd58246f6f62a14faa4
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that form a link farm, many hosted on compromised or disposable domains, suggesting an attempt to direct users to malicious content. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm the malicious nature of the file, likely for phishing or malware distribution. The presence of a QR code lure further supports a phishing-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://chcial.ru/uplcv?utm_term=free+download+bully+anniversary+edition+for+android PDF link annotation
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/fofunojivukumazan.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/9259649466.pdfIn PDF document text
    • http://uteambio.com/upload/files/gemudeloputukanasosexas.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/kilenazuxifelawakilemuzim.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/zugumijulifezu.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/20931652247.pdfIn PDF document text
    • https://arendic.cl/files/61924788963.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc9ec59cef---25845139172.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/36134314297.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/zurusagexelupikuno.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/43175463828.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/wisikemufiporipuguwoki.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/62c52ed7b459d2685a453faf3ae6fef6/duzukenoda.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/6300994365.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210907_101545_182.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f50e182d2830c47aaf8f6d9f29b9a34c/jefavigaju.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/vuvizekolotugokusobuban.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/96208820008.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/guvevugorezizerowe.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/pabojuwimoxij.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/piregek.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/rasazugazuzegekeg.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/47956324712.pdfIn PDF document text
    • 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_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 10828 bytes
SHA-256: 1089c829a6157ca1edd7c8f9fd04d28b6f15ad93dc89efdc80a4bd3ca3744305
font_02_sfnt_off00010972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 17364 bytes
SHA-256: 53e9d1736ef36763911b71c0b7d2446cdc8b7ac97591a94953b178130fc34863

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