Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5ebd5690cf1e01…

MALICIOUS

PDF

87.5 KB Created: 2021-09-21 18:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 034faec0d955c7c055948f9c1a87f8d6 SHA-1: 2e509300ed9ea623bdeadb4eaab7427f5bcae909 SHA-256: 1f5ebd5690cf1e0118b668818afd282fce50a10e220ba04762bd807cae38deb0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. Static analysis revealed numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs to create link farms, likely for SEO manipulation or to distribute malicious content. The presence of these links suggests an attempt to lure users to external sites, potentially for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=the+underground+railroad+pdf+full+book+colson+whitehead PDF link annotation
    • http://lanaecoloridabruzzo.it/userfiles/file/samirifotetiravigonun.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d73fb901cf---68191206201.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161302c982d6ab---90494096565.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/74333953249.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/20511235680.pdfIn PDF document text
    • http://carbonelite.ru/file/nizatidewipobe.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/xexal.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/rimatuvavewuterel.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/93956183936.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614455d68133e---74876566.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/19109557575.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/56673564369.pdfIn PDF document text
    • https://sergiomauri.com/images/file/zezitugareku.pdfIn PDF document text
    • http://getdol.com/page_data/file/bepipezogaluxadowe.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/18908885027.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/fevixegelurefilozutopo.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/kigixojapofisetemiw.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/binakajozufuzadirosagiz.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/fovakiboburegoweti.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/konege.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/55975923515.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/tawupotenukipizakoranela.pdfIn PDF document text
    • http://zerosquareonline.com/file/44954603275.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145b905ad865---39288361385.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_off0000ef31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF31 18092 bytes
SHA-256: b89cc73a4741d732e59a42bfc0dc25491885bf0e87a8ed84061f5bc7c32756b5
font_01_sfnt_off00011d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D93 11280 bytes
SHA-256: c5c827e245cc7095dabfd7e48390ad1b2e44a03c56a633c174e26db4b19a87d8
font_02_sfnt_off0001379f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.