Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d20ebc7d1ede004…

MALICIOUS

PDF

86.6 KB Created: 2021-08-22 01:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f9185242dcb2e07f6c883479adee2873 SHA-1: b03cb069c872cbb3bc5f31bd8ba1a491da0c1554 SHA-256: 8d20ebc7d1ede00407257a5f132ed9737862491c686942c52d9ba07dc0f48485
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. These links likely serve as a lure to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://harryfok.com/ckfinder/userfiles/files/58187736446.pdf In PDF document text
    • http://global-insurance-broker.de/downloads/59031391114.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160715b7d34836---4810105794.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/77825792229.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26ca912423---jutawokopawizuwowoto.pdfIn PDF document text
    • https://quangcaobienbang.vn/upload/fck/file/2197368723.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/detonerunojibadejepimamaj.pdfIn PDF document text
    • https://33mobility.net/uploads/files/senopanog.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/kugebirev.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1611fa4e17d02b---17129082242.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/mosijijoxegojosabifamavu.pdfIn PDF document text
    • http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/wuzuxewonixos.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/46643773471.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f93aa5bb823---runelilak.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/jugukikamo.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/lorufativubazulal.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/8229ed4ab1015d0342eb6199338f3f8d/75334230244.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b0975bb02---34389778377.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16096bab52cb35---fekizefitidik.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/43637658632.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/zedotaf.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/kovewufuguzagodumepoji.pdfIn PDF document text
    • http://yuha.be/_files/file/ripuzovapurivinibuwukid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=f%C3%ADsica+para+cientistas+e+engenheiros+vol+3+serway+pdf+jewettPDF 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_off0000e2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E5 11508 bytes
SHA-256: 2ccce1f168531e7df53f296c45d16566682918f0a5a45311aa1eb3d2427944c6
font_01_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11600 20708 bytes
SHA-256: 70fee672cc8bcba981a60a7c737093f5d9ef2ef849e67ce7ce928f0999bd6c71