Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9b21a94c6737b4…

MALICIOUS

PDF

84.4 KB Created: 2021-09-10 20:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6eb5c91683b4a17403d637fbe5faebb7 SHA-1: 5acd43ef28e3e9c3a650ae6249847ba54ec83944 SHA-256: ae9b21a94c6737b418ded15e175d39e0ffaedb77dd47676559faaa70b8e1314b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links, likely for SEO poisoning or to distribute malware, and the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' points to compromised WordPress sites being used for distribution. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=how+to+print+save+as+pdf PDF link annotation
    • https://0924055971.com/uploads/files/202109060050361393.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/46483866036.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/1133013668.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16133c541cfa34---jobudimanidagoxovebef.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/najikutelavut.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/97099864566.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/bepomivumuf.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161388a79f4030---widis.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210901102459.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210908_E4F55293DCDC820D.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/94021938045.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210910052003.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/fewosisarurelu.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/sixisiri.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/df00d327d3b358255aeb6cca48f14e9b/vebiwulagufaxopejot.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/64766126847.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05257f632---86492787026.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/ludedu.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/sozixulirewepomivemota.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/64713675954.pdfIn PDF document text
    • http://katachizu.com/img/news/files/wepaxoniluvipotoxopivuvom.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/lenujesazuvola.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/vuvurep.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161300ee904d9a---98376374805.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/jobebozubesabomikudakavud.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_off0000e69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB0 17372 bytes
SHA-256: bb1f28a96216e2933ddc693c08789d67b4a640dd9ec2fbf0b5d660ab6fe08f09
font_02_sfnt_off00012bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD2 10588 bytes
SHA-256: e5c0dc9426d2d2cb211b42fe4ef5f7d977a60c9cf5b964ad086cf951afb78bcf

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