Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63a019facf298ad…

MALICIOUS

PDF

99.1 KB Created: 2021-09-21 07:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a693f14d1f851a3ed7d0ac20e5955f25 SHA-1: 5406043fc8fb31d3c67973a92b6c2eec5457a134 SHA-256: a63a019facf298adb1a22fe16f35f3adf52bd70ea5562ab41f8acad69cdbd66b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability to execute code. It contains numerous links to compromised websites and a deceptive download button, suggesting an attempt to trick the user into downloading a secondary payload. The presence of embedded JavaScript further supports the execution of malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://allytemp.ru/uplcv?utm_term=nexus+7+2012+update PDF link annotation
    • http://opuspointpartners.com/ckfinder/userfiles/files/bamawamukasogage.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/jidijuwewixoxiz.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/davoregewuzutolugij.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/54960807802.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f193a13f0---kexoxisarinapelido.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/07b326793fe3b355f94bd272f9ca8e04/bodig.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/39952637063.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/463ebf5e5c86209a213fe9aef0892a8d/koraxadamivo.pdfIn PDF document text
    • http://df-foundry.net/d/files/pasiveziranakoxiresevomu.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/tajomawisova.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/vemidogogidozuforut.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9108a948a4ccedb27ac5cb29cbba917a/liruniguv.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/20569443346.pdfIn PDF document text
    • http://bold-iot.com/uploads/files/202109111045473303.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/61300588375.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614778001f584---48847667213.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e75a3348e7---84731694780.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/62221894357.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/luromome.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/73918132534.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/46735744290.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/suruma.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_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001305c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305C 20788 bytes
SHA-256: ad281237181a3a3918dbd74ac7fa41b5f85c43ea7ce3053b01e52baf9128f5d2
font_02_sfnt_off000166f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166F9 10444 bytes
SHA-256: 89a770b50e519033823a7a1fb4b1f63d180f325a0d9aa383c823ba50a38f8a30

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