Malicious PDF — malware analysis report

Static analysis result for SHA-256 269967505e78aa7d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 19:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70d848ec8e4028c0b3167744d73d20da SHA-1: d694438f1ccc32945face393deea07eddd534766 SHA-256: 269967505e78aa7d3a903b0ed687e2dca46611400d231262db043ea4efe97c36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised or disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The presence of embedded URLs and the 'download button' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resheto.ru/users_images/fck/file/33074362699.pdf In PDF document text
    • http://wintec-samu.hu/uploads/files/boxebivufewaf.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/25439955921.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/gekiponotejokexegilixojub.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/6291970266.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161475404df081---57598499597.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/21848183844.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/xufubora.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613065e6504bd---bezeliliremuf.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78965893812.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/0cnjf5uu46pl1v80gumn1706lj/zibulovabetim.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/fubobejubisinimole.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/20031404969.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/pipidejekufup.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/lawinafororotanajitotaf.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/tigut.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/tagijemubejara.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/mijamekepome.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/2531586703.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/vigeturekalapofo.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/mawobum.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/65033349297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=karnan+movie+downloadPDF 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_off0000e67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67F 10288 bytes
SHA-256: fd134716924536d555235d8accef1ffea50c70df122b7b3e5392634eddd61204
font_01_sfnt_off0000fd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD93 17256 bytes
SHA-256: 83f6f8d99f017d8af880f6d49963b9c2584b145fdad0532eee9daf4a0d2581be
font_02_sfnt_off00012a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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