Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1e28ea0d56cecb…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 16:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dcbebad719ad6980099e2e11aa07dc15 SHA-1: 481240449d6bf61d17fe19ad52f1c218b2ef6228 SHA-256: 9c1e28ea0d56cecb19ff406ad0adfd260e8b1fba013098179bc1c83ee8be682a
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple potentially compromised websites, including a WordPress upload directory, and a specific URL that appears to be a redirector for downloading files. The presence of a visual download button further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • 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 https://pistant.ru/uplcv?utm_term=road+rash+apk+for+android PDF link annotation
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f1863583d---vanalanufejemugok.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/kovomasubogapelara.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/63047718462.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/10366195571.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/foginusuvomi.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/48060911107.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/voxigavidalekeso.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/zuvafizuxewesi.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/73636339766.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/68930549369.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/77459274394.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/lifakorodu.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-10/20210910225127714863.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/xoxaz.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/vekisuxemorafela.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/mageno.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/tituwenafiwoxalerov.pdfIn PDF document text
    • http://epmachine.ru/d/files/52719890150.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/da66ef6fb70f05766439f46dfa7ded86/vixixifuravizonikojijon.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/fdd82db7a6902fddc6c992b680159924/gugedesan.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/5033be2fee2e61ca9b829f146f49c8ec/negefu.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/948388259.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_off0000d174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD174 10456 bytes
SHA-256: 3f977afca87c44a89c745baf1267898007b2d1934c282e61211022d5bf6a6a16
font_01_sfnt_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 18496 bytes
SHA-256: b447fa3cd94941071004d89c3464b0f439f97b29ff318218de8d365f99f52a17

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