Malicious PDF — malware analysis report

Static analysis result for SHA-256 28983a70d366f12c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 02:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 119cd80584aa4802cf01a88821ee7965 SHA-1: 412154e6a9ff5d589341d2d23660e008e531485b SHA-256: 28983a70d366f12c9322b12fefe52c6f635cbaf0cbaa7814dd5ce7dab4f8f37e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rigdrilling.org/userfiles/file/4175839837.pdf In PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/nijamorurugemebenida.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/biropedejuzolusozamabenek.pdfIn PDF document text
    • https://paradigma.bg/uf/file/pekigonoluxatibul.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ecf4c22f3---74727092484.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/rovojizizifesibajuroger.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/wevezinepoju.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/91273820862.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/12496956266.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613521d256aed---77214127289.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/48140882884.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/vizatomifonumifo.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/dadavu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/67586d4af56974d7277754935e7a3fa9/15747166875.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/45552712542.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdbee0858d---56297373945.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/77002585461.pdfIn PDF document text
    • http://ms2oke.com/contents/files/8236295827.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/nisasisar.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/2952718990.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/161418237cfd99---35066538968.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/86963862898.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/vizuloribalumodaguritawi.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/vuxiperejexugibukividinal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=final+mod+narutoPDF 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_off0000e193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE193 18188 bytes
SHA-256: ac3ffffb6eacafb2fb36e7255a9d67fb0cd3de8969d1626a34548c45baeda061
font_01_sfnt_off000110a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BF 10184 bytes
SHA-256: 131373893512c2094026ebf1dd8b8b00eb61409350634f4578b36abbcf445b79