Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dbc9f7f2b306f71…

MALICIOUS

PDF

88.4 KB Created: 2021-09-05 22:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 405249d0109a44a3f6467136d629531f SHA-1: fdf8b2409bb0d3547913875c2c739c59bad8ae41 SHA-256: 0dbc9f7f2b306f7104494773bbefaea58bf3dc6684058d94f8a436ddfc797b01
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised websites hosting further PDF files. This suggests a multi-stage attack designed to lure victims into downloading more malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999acb20b45---vevejuwodafukaku.pdf In PDF document text
    • http://alliance-ltd.com/userfiles/55894659981.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783fd1852ab---sefezukapiwozatexidomom.pdfIn PDF document text
    • https://hirurgija.me//files/pemugix.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/96972907310.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/51855f0d421ac99e40c32d57c9488a5e/raradomidipowesoresi.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/bedejebavubamazanafabi.pdfIn PDF document text
    • https://memoservicesrl.it/file/16048285960.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/zowotuso.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/6788209659.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/95815574708.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f3331316f45---91706248575.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/xajaxemikadezidog.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14e7d484c3---feloxe.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/850d63da556a1e8a1c2accdde52afe98/kovapukanovilav.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/55592942494.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/3425451088.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/93381191a3b0cb44394a35489cdafcef/jugegujabudezobavok.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/63838847140.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/vinatasobubonod.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9d2ac513a---80987627545.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160baae4c2f5b1---17553127005.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/20952585627.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/50911320337.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/94481544929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=yardworks+173cc+lawn+mower+manualPDF 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_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 17800 bytes
SHA-256: 042efeb4a8a0d8fb6bf5b3246612303140ebdb4d6492be0bdb6e9b7cc9fedfd5
font_01_sfnt_off00012251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12251 10876 bytes
SHA-256: fd6c9caf26510adc298aa9f462cb52a674d9178ffd82f6fa15cb5765b5799ca5
font_02_sfnt_off00013b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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