Malicious PDF — malware analysis report

Static analysis result for SHA-256 809d19d6b8cd6e5b…

MALICIOUS

PDF

95.8 KB Created: 2021-08-01 07:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ac219537c30b75f0b89c7f74b0cf62bb SHA-1: 3eda6d694a7963894f5e2973a4e70f787d6a81e0 SHA-256: 809d19d6b8cd6e5b729e99b4a92fec5bd135135dc4047eea8c4ef442fdb26de0
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 CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://davcpundri.com/css/file/25778908306.pdf In PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/fokuje.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/274374736.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/suwasakegagikadikat.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/nodivepiw.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/aef2541cb5fa9200a8455365c40420b4/fabobovepebitunema.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/12308272863.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/7221597659.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/xutirejokejava.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/petomijot.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16075a33cbf5a6---16974715734.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/xupanoxedijogakogajego.pdfIn PDF document text
    • http://surtek.biz/image/files/20150101_191533.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80f1daaf5---sokub.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/14874537100.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/sesewusudufaxojijabas.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/vonojepox.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098332a12fcf---kodebilu.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7efbebe2e513dfa4b70948440717c46c/zolupudoxupe.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54383d1fb0---matasowolukipewateturi.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/migida.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/woxevazo.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/76c3938f1e4a30a9176fc7295562b84e/38579350218.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/tawewof.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/begezewipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=am%C3%A9lie+poulain+j%27aime+j%27aime+pas+flePDF 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_off00010fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA6 19728 bytes
SHA-256: 0178414990cd48a1ad7a35863ab699b9b6b657a503b7dd169a0dfc3c12e4d187
font_01_sfnt_off000140af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158C6 10720 bytes
SHA-256: 3000e23be9906cd3233f5b5445f3b482b709ed0d39a66547df3355127f1b824f

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