Malicious PDF — malware analysis report

Static analysis result for SHA-256 184b2942525b8374…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 12:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: cf3e758b5d204ec8c0d21f668794f9ec SHA-1: a71bb2cd0c357e94e69dfaa4655f16cb4a8ffa2d SHA-256: 184b2942525b83742c2431921b09b165e925897bcb9c8f83e4a5cbfb53cf417f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://mcutech.net/upload/2021/09/file/16316972981666960637.pdf In PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/8957271095335748dfe2976eb21e564c/kibuwa.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ab7v0j1mncktq7v9im11qh8qan/negalerut.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/ribexomafave.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/39341922866.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/55403830771.pdfIn PDF document text
    • https://mackbeks.com/files/file/wetunawanuvamuwebalibi.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/33547337477.pdfIn PDF document text
    • http://brenderup.ro/mm/file/sorumagupibasun.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/3773109165.pdfIn PDF document text
    • https://egf.tw/test2/images/file/dokujupadixikekugirup.pdfIn PDF document text
    • http://belloverde.net/emailer/file/88382793711.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210904_072151.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/xubodolodepabuba.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a5d3b4494a23ebe4835066eeb867ea6c/19412041578.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16134f02a1923d---63743352505.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109131200349422.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/50642885581.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/pifemejerexep.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/10007509915.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/bumiwobinazeginajomezapu.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/pakopojet.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/jutafebotaforanajikusodu.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/lojon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+do+i+sync+my+email+with+my+phonePDF 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_off0000d486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD486 10872 bytes
SHA-256: be3068ad1dfc12c7b6d55c50452b2f34a55817ff2d0d623f9793438d29f5aa07
font_01_sfnt_off0000ed77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED77 17956 bytes
SHA-256: 553729a3dd70a92dbd62bbdd68818ff64931c3047a04c248fd7cc52565378ca0
font_02_sfnt_off00011c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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