Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e554db4c0235ac5…

MALICIOUS

PDF

73.6 KB Created: 2021-09-25 21:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 22aa3fefe79ca15459fe5cc151a6db89 SHA-1: fd62110c95763db314b0fa243b98e81decc1067c SHA-256: 7e554db4c0235ac522004d6504f785159933dfd65dcbc17dc76269ee87f050b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=how+to+restrict+websites+on+chromebook PDF link annotation
    • http://chinhlytailieuluutru.com/media/ftp/file/59337599981.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/wabefidipazedorawugitipuz.pdfIn PDF document text
    • http://methese.com/upload/files/kedopesexojam.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/78291954780.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/96094516543.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161475ddfe9ecb---gulopolufifo.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/95946634186.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/nekuselebepoxatokimame.pdfIn PDF document text
    • https://cicimanis.com/contents/files/74958141996.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4fb730b434d0729602df8e01e47d4087/948829185.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/39579892934.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/9045955028.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/lagamuwof.pdfIn PDF document text
    • https://lapakunited.com/contents/files/duduwixadewikopadomax.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/29539046325.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/sazoxedesape.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/vakexu.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/kidovulewitepovofexeloj.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/64640974463.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/detojoxabulomoguvo.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c55cfcb076---88963092403.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/22636936866.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/1633853367.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_off0000bb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB28 17648 bytes
SHA-256: a5300cb89933f5ae1b80207e7ebb7c2588e636edab02d6b1af66023d34197088
font_01_sfnt_off0000e83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83F 10596 bytes
SHA-256: e2c6d12eb3eec84b841a1a808f3fc068cca96005956bbfb963157c68758f2ef3
font_02_sfnt_off00010052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1