Malicious PDF — malware analysis report

Static analysis result for SHA-256 da169eb7a7c5b145…

MALICIOUS

PDF

68.4 KB Created: 2021-09-24 21:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 87ebc55b34a130a95825c34261329333 SHA-1: 2bf7d6783cb27b8222d13c6a018495b31c490809 SHA-256: da169eb7a7c5b1450b3ad92d260bced6e5b169712eba8bd62852fb591e096108
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, typical of a screenshot designed to hide clickable links. The document hosts numerous external URIs, many pointing to compromised CMS upload directories, suggesting a link farm intended to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://etabetasurvey.com/userfiles/files/fevetoj.pdf In PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/14585564939.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/82740012752.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/gegubevitirujidufuroxev.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fed98b0e2f---32911756322.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16149f96b824f8---fonokaduruni.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/84481611450.pdfIn PDF document text
    • http://armanetti.com/images/niwozapexofaxis.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392ff87429b---73538697561.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109121654487768.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/vipumabelufenu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bcf4d83f7---zunozejogomu.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/mogud.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/zilepofix.pdfIn PDF document text
    • https://agrando.cz/files/file/badedolipefu.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16147dc6ee6731---todixetu.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/ralasason.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/vagofewu.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16148ce35d9593---runojunujoji.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/sojonazudu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16130a5b2bb49a---12800037547.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/jijebunosovumobamadize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=grocery+list+app+android+and+iphonePDF 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_off0000af45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF45 10764 bytes
SHA-256: 7cbfbaf9f7a1f3e2fc23d2b0a1d38dac4ba7fca1af8f1cc97333020eb6600134
font_01_sfnt_off0000c802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE014 14320 bytes
SHA-256: 4ae290f4c079df3eb0cc5ef75b1efeb5b24b55c5e64c1aa84db892467284121d