Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc335726037ff6d…

MALICIOUS

PDF

75.8 KB Created: 2021-09-03 21:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d36dd0667c5ca4f9eb76729fdc12400 SHA-1: eeca84135d1256b2006e2dd74f4d977aadf57af5 SHA-256: 7bc335726037ff6d1d0470fafaf1b73c48d49a9a8d332f95b29970a214e13f29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads, likely for phishing or malware distribution. Embedded JavaScript streams are also present, which could be used to further facilitate malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6e73257a719919672a057a9dbd3a20d8/zazupufisikunexinelerinar.pdf In PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/f93deb2808368e837272ba7a0c67df01/wekojo.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160831b79b9890---zufewusoxiduselopukuwo.pdfIn PDF document text
    • http://stl-hk.net/userfiles/fudorobugukulinabovom.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/netobenisanelat.pdfIn PDF document text
    • http://falls67.com/clients/50406/File/36915160896.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755ac6cec51---fovokesedogixokobax.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/nesobelelez.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607151505c32b---81516550843.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/66575225871.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/jujuxusadimukebuko.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/60523935415.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/5u9p7e31kh8j1k3osne9ei2iaq/furikonige.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9e12f9cf0a3717259f84e7abbc52ac55/sexomalefejitifapazijab.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/8ea58d88b2fcb65eb940e8c192d3d010/41061946097.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/minalebarafizusaridez.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/814128d5298f5d87fd875d19db808ffe/xowemasufeseminaxeduge.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/rozitinerojiwevutikavex.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160afb212a22bd---64327045118.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a872290ca14---keguxutubixesezisiwirupik.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/85069619848.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/23258250582.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160edcb8209113---sapuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ronki+basah+basal+adalah+pdfPDF 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_off0000c178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 18416 bytes
SHA-256: 44cebb126bdc7828c7af1e6dc07ce3c77b580797e40ae566c24d87b7e6821601
font_02_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 10540 bytes
SHA-256: 4064ebd169f395203cda78fb86b29b91f07fefc9da49cbcd1e27fd2184cdb27f