Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8d8452173745de…

MALICIOUS

PDF

108.3 KB Created: 2021-10-05 17:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 63b576fca75f912eb7c9bcd86b252d38 SHA-1: be0db1365e526e9a140acaf78afba4eaa7ad4422 SHA-256: aa8d8452173745de4fd3ccf167125c757c6d3cc9b522d40e3c810272f020d9c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. The presence of external URIs and a link farm structure suggests a phishing or malware distribution attempt, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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.gieskestukadoors.nl/ckfinder/files/files/kenepilibutitidotepipa.pdf In PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202110012258148654.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/vawegixesiragikixeku.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615a3a67b7e67---kifuwomukogoxeg.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402cf5da9b0---jametediwokoro.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/vrp6drtrg82hdo9eamb9g6mse0/livowawolakatokedigowejo.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/5414009cafa78995cc748bd59bc83c29/54687627664.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/90960234953.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614902574cd22---22829806084.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/waxezuraluraridi.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16158e40045c7e---duzini.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/6ifh3va3mfr8oabqsse2kidr45/10676440969.pdfIn PDF document text
    • http://farmina.ru/uploads/files/44961041827.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/12200221148.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/25745843853.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/vomamesatogebaju.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/sidadajozazutupewimumud.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/gobilotariwurumobi.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/jilebotupudeva.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/zimewakuxirukarekegu.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/50449171977.pdfIn PDF document text
    • https://suruburi.net/mm/file/3904022291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+dream+guide+lucky+numberPDF 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_off00013c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2E 10980 bytes
SHA-256: 6936b1bf62998d2151c1c4f2532b55d130150929aeb3a96f5665e16305fc1d47
font_01_sfnt_off00015578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D8A 20672 bytes
SHA-256: 236a0f89bd1f74de721ea00f19029dc610093606c4347203e84e75014e2d2373

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