Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7f3404eda04571…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 10:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 385e660dc1b7b2e759f765dd873b27c2 SHA-1: a9c2d5c7ec1b6a750b844e2be7a1d806e3402c45 SHA-256: 8b7f3404eda04571234d7ff8d39d84ce76f25e879581a23c1009169165680d4f
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. These elements suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://litho-and-co.fr/ckeditor/upload/files/3954648697.pdf In PDF document text
    • http://pieseclimaauto.com/files/file/najepifomidosegopekubugij.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/komumo.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/bovopoxelaluzu.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/27198500519.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/nudowasoxerubuxurasowonu.pdfIn PDF document text
    • http://punaide.com/userfiles/files/42695920697.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/sufomobitixidifetipu.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/60988195312.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307345f115c---sapigikadiwum.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210909_63A7622DC17CD6A9.pdfIn PDF document text
    • https://somogyplusz.hu/files/surabilepevu.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/46031620853.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nopitipolekoja.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac42b84c3c---duxifaxavatumunase.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/zupotifasaburojodobenonus.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/kojojoguw.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///xibopizixadulitukerorapi.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/zojipajatumuletufu.pdfIn PDF document text
    • http://etre-belle.su/images/file/68618008256.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1630808041.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c8764e597---lerirefejelunu.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/31291638464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=plants+vs+zombies+1+apk+full+version+downloadPDF 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_off0000dc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 18080 bytes
SHA-256: e2c42886fc724d0025903141b7b7d52793b3fc2e1f1209b2e67b99b67deb9af1
font_02_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 11256 bytes
SHA-256: 23b9c28a3f3ffb566e43877550bee3e4a9793b87d7cd282c5d39a938d352723e