Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b05e835ba1e43e4…

MALICIOUS

PDF

72.2 KB Created: 2021-09-13 16:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 807dd942e20975d37e3f49158268016f SHA-1: bbde2c1276a0f6477ef3570dc0ef8833c41f00b4 SHA-256: 7b05e835ba1e43e405a494dbdec2fd9f48420e005fe14b84ec4c409d522b13ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on potentially compromised or disposable domains. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, suggesting an attempt to distribute malicious content or phish for information through these links. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://minhvuongthuphap.com/upload/ck/files/dexenatujuxulefiludowe.pdf In PDF document text
    • http://risme.vn/files/bijadepetemon.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/39356391199.pdfIn PDF document text
    • http://zatacorp.com/upload/files/nufirunalod.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/zokex.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/54625233322.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/regozokifebonomabepabixo.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/xixujokenubuga.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/65107757906.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/32145397105.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/rekupogolikunedepona.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/busojerelotajonevodusen.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/videvigoteseritulumixa.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/jijofu.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/libesobivodimokiwafebu.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e4b1bcbbe2cbbeaf10b4bc621c299a3f/10378438838.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cda3f4b9bf---wuberesona.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/94219683628.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6f0b54da0---joxatemax.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/rojoxiku.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/59783278118.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/20177497714.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/wopaforoburovakexo.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/048f72b16513bac51d103c62f2409bb6/rekukabilowap.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210911_1661C8133BDA21D6.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/86241944678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=instagram+private+profile+photo+viewerPDF 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_off0000b898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB898 16088 bytes
SHA-256: ae42ec15d171a5e53e854459e944895f61ea8d199c5b179636dcc1b408429679
font_01_sfnt_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 10908 bytes
SHA-256: 499b891f1b689e72d3aedb9fa3ee7ebfc30163117c18bf3f37b5b46f725c1b53
font_02_sfnt_off0000fad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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