Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a64059a1aeec3be…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 14:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9562e981382bc3ff73806f24bf92edf8 SHA-1: bb2c75f58b85ba1f5f795a8382f13d346bb18bd9 SHA-256: 9a64059a1aeec3bea5f587489eea93ced60d22018fff9fe8a71297c85d25a069
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised websites. The embedded URLs suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc60805d6---kawagetader.pdf In PDF document text
    • https://castel.ro/userfiles/file/16611775056.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404f9f583cf---gilozixuzuxilan.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/58840954426.pdfIn PDF document text
    • https://premiersuli.hu/files/files/59099738065.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210909021349.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/jogipe.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/38666087701.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cecd07ca8---kakugakifuvavikusezuno.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/fisotajaluviz.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/rabipokilepinevifuvunefa.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/2621616340.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414057678ac---99894919539.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/zowuvemuzeronamanavod.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/60559227833.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c072272fbbe7973fce34c070c00d63bc/6626534909.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/kalolinepisotafuvekoju.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/bolajeridurogakitibijetol.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/genufidaxuxasulun.pdfIn PDF document text
    • http://rld-carbon.com/file/11956082288.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/domuwinosoviraveda.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/damupezikamebarig.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/46112417548.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/dobubuxonaxokelogusesefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=redmi+5a+miui+romPDF 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_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 18208 bytes
SHA-256: ea82cbe039bb4ceaa2b89018e8ac6099bd78611e9cc031375b3106f403e4a4c8
font_02_sfnt_off00012529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12529 10272 bytes
SHA-256: 288282f434ae9114328bdcd36c64319c0943dd7a231f03a2502f5ac1373d6171

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