Malicious PDF — malware analysis report

Static analysis result for SHA-256 a886dfe115a99355…

MALICIOUS

PDF

68.6 KB Created: 2021-09-18 02:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 199ad693bf517ea3bfe887cb9d1624c2 SHA-1: a94e4ab329032bf70716106a1133c24453de9f1f SHA-256: a886dfe115a993554f83d7614a4c2729bfd00f7f322ec14524d322ec7f57a404
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure with an image-only design and clickable action triggers. Multiple heuristics indicate it functions as a link farm, directing users to various compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.hermosabeachbungalows.com/userfiles/files/linulunufitejonig.pdf In PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/02c8d668bdc61354cf179b40f8acddc1/sawepuruxoxevavozoben.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446f1cb76c8---talaw.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/4816405758.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/tudifetotakerajezakezun.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/30061910988.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/89451866102.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/munamovulufepositidozef.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137c7d2cd3e8---rufesalurabozosizupef.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/lopularonadazudejinaw.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/sivegemamegewedineterukep.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/woviredibobare.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/91379147972.pdfIn PDF document text
    • https://stormester.no/files/file/junuga.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/44776683198.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/60396742336.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161391da59738d---21306904383.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/06044bc0634b609507f49a01a94963a5/zapodowubebujubowe.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f8bfa00dfc968494b118fe830daaddf7/wexurubojeb.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/umepks16mjfpldhih07lbc06cq/sipozubuduferani.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/59218492845.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/84064975038.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132a5e7eb811---54964557812.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/46222809499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=do+you+need+internet+security+for+tabletsPDF 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_off0000b14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14B 13892 bytes
SHA-256: d2e0b7eaf1321efb8a93b8958642004e4b55c693190aea6da9e0fe83342f2462
font_01_sfnt_off0000d392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 10824 bytes
SHA-256: 822bec55036eceb4d9b7ed75bbbe2c6c14fc0a15a260e4000fe89cd2e6a167de