Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a177b71184ee15b…

MALICIOUS

PDF

75.4 KB Created: 2021-09-12 08:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c05d89fc3db1c522a486ffd5f88e26c SHA-1: da0eb8c7f65c0b2ff121e1407860f2648212dbc7 SHA-256: 9a177b71184ee15bc490a361f2f6ea5f4f236cc3d75909de748efebd443413e3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable or compromised domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of numerous unknown URLs points to a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://lodoshosting.com/calisma2/files/uploads/98837986025.pdf In PDF document text
    • https://ntiverification.com/userfiles/file/19976708529.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/3159269783.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/87413386491.pdfIn PDF document text
    • http://zerosquareonline.com/file/74047154478.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/62369989637.pdfIn PDF document text
    • http://chinahongji.com/d/files/furivukoxebipipigozawuni.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/434088df0666480770f2f3d1c087eb37/44809940878.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/22686895626.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/wutuvatuzarepipuvekezon.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613113c4bbd01---67819168793.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/pifozivozozizikemokuwiwu.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/39479767980.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130832a8316a---rixewubagijokoxanun.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/xefadabetuvagazilugaxaru.pdfIn PDF document text
    • http://zl369.net/userfiles/file/97728912111.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/72673397353.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/148548632a4ca0d3cef2bcc2c6137807/12963643980.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/miguf.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/jozipupumelokupetob.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e05d26ad64b28475cab6a513568bc5f7/12221229699.pdfIn PDF document text
    • https://tigapilar.com/upload/files/ruvokimukozasemudu.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/dunijotosesomilevuben.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/35582947029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=watch+harry+potter+free+online+123PDF 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_off0000bb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD351 10860 bytes
SHA-256: 05cc97b2e819cedf148bbd93a923feb4a4782230c98b0c07df677075d36fac18
font_02_sfnt_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 19880 bytes
SHA-256: ab03681e673c051565becd481fd5b170ab56e9b6b4bf01364a34dbaf7cdcf6dc

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