Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81ab5fab3b5d2b1…

MALICIOUS

PDF

86.5 KB Created: 2021-08-23 12:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: cd06dd6aebe259e1f6af30e53902d1c5 SHA-1: 480aa1ff70f3ce934fe13cc2fa9d202ed6f609ad SHA-256: f81ab5fab3b5d2b18767068a79f9180d9acc64ff89ed7331b0ea61247f27ea32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://remoteyourstaff.com/calisma2/files/uploads/93255082280.pdf In PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/rofifinoxibam.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/rawiro.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/73913431314.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/bepotiwosimagobafovox.pdfIn PDF document text
    • http://cissi.it/userfiles/files/54582369711.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2872107160.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3402aaa8f---zigirepalazibapowuz.pdfIn PDF document text
    • http://air-ned.com/uploads/files/53744913657.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc41a1032---kefitobetewesenoko.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843ef0a9767---fadurupur.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202108171356579116.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/paxufemikemetug.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/jivoweromipuxesusa.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/nowarefosogil.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/48380765278.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16089ee7777518---59272900631.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/gepumatimilojulibowabisa.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd89deb6c29---dozorodofesa.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4e30d693---videsodaxofovibupoxebuj.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/5638221638.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/30753297755.pdfIn PDF document text
    • http://keitbg.com/images/files/89524354993.pdfIn PDF document text
    • http://platcometals.com/images/file/88027464288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mehandi+design+simple+front+hand+easyPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/jidozewubadarewar.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_off0000ef0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 11052 bytes
SHA-256: 3d510a7993b45f67097199addf9c70059b09c6573294b87cd86ceecf1200cb21
font_01_sfnt_off0001085a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001206c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206C 16452 bytes
SHA-256: af5451f5d2ee8c2334897ab3e47292b1196341fca13aa07ef437ab673f3b9e2c