Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaad8fbe82c68acc…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 19:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 27eb1a8b6393073cca9c52fd9d8192ca SHA-1: 20d78c421af1559a7376dc19a5f59332527431de SHA-256: aaad8fbe82c68acc038fd4cf44231653800e78f2043da6851cade1b5c50e5ae7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

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 https://garglob.ru/uplcv?utm_term=battle+of+warplanes+mod+apk PDF link annotation
    • https://verner.lt/images/files/podiwaxigalubogowazokek.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613d16cacba95---35601503935.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/273b15356c61ba05e09911b9e25b1a7d/16671048871.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614006e335643---boropizek.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/7edee94a44094a68b232bfce5776f735/jigamiduzusa.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/gurunuvepegenoriji.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/fewixi.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/58922072734.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/funupafawalurav.pdfIn PDF document text
    • https://membermimpi.com/contents/files/51256121150.pdfIn PDF document text
    • https://conrays.ru/f/data/dulabidefinaw.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/afe5088081376d1a5754565a9761c7fd/78401463838.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202191443151678.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/vafebabiribumaxa.pdfIn PDF document text
    • http://thevalleytrader.com/files/20385216127.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/64457082072.pdfIn PDF document text
    • http://emaaravm.net/upload/files/43118895905.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac804870d3---dexojisagenilas.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/pawusizema.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/37410679872.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/9619578449.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/26699916763.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/18197305571.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/28326505562.pdfIn PDF document text
    • 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_off0000d979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD979 10796 bytes
SHA-256: 493033b97e572dc1fc1a1553249e3b4c543de33a6aa01c23d860568a204218b6
font_01_sfnt_off0000f277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF277 17556 bytes
SHA-256: 187e3fb9c5b590358689093e2460b03021a6eced0d29c3a0fba790311f3efc88
font_02_sfnt_off00011fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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