Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79c029ecf1f088a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 00:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f7d0a321dee8ba79a28b729e236684c3 SHA-1: 653004a73ef471ed67d15243897aa6dfdb115316 SHA-256: f79c029ecf1f088acdbe3d78a9934b5d7cc398e9a02f27e61962d97d60db9872
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://yournamebadges.com/withyourdog/cms_uploads/file/91811434281.pdf In PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/loxuvomavasavu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f91217848a90535b8b48abe8c72deb28/fuxipodap.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/xotuvok.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ctqi8jn6hd9v1bunpg2eqmf801/nusipozejewededuwigab.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d02dc42d769---15232297111.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/79432455713.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/81969229279.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/zatesufuwifil.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/50574108281.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f4e8689afb973217601d5a78232831a7/18762304549.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/29218983659.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/300a514804b589c728bc0ac13a283545/99124875027.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db106c0a07---44399971762.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/datagikovofu.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210713054250.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608079dcabe19---salobuliwigemut.pdfIn PDF document text
    • https://mavibusiness.it/file/64914324761.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa38c43d91---17512158007.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160795c2d80f82---67129138692.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/linibumejodu.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/kunojisoluwakevi.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/dipumawebitetuv.pdfIn PDF document text
    • http://bscartridge.com/pic/79001211130.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/50128cb81af0c367c9d037d95b381511/91923306361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=introduction+to+business+b.com+part+1+pdfPDF 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_off0000d5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 16816 bytes
SHA-256: 71775d32d5390260523566033e3a9a25ec8142ec347f98065317a63e8aa1d87e
font_02_sfnt_off00011970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11970 11044 bytes
SHA-256: d1ce2f942347cf514660cd273bae71d5162ebb8a2cd5e57debcf92cfaa51e0be