Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77b3a881dfc7bbe…

MALICIOUS

PDF

77.3 KB Created: 2021-09-21 19:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 463d20f8566c2f93c31fc79825b55303 SHA-1: 9ccc41c2fb108bbfdec94c438c4266ebbbece6f4 SHA-256: f77b3a881dfc7bbebc8d320bcca731bb1546cc3dd108b1bc6328beefc7a5116f
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The presence of a URL with 'utm_term=asphalt+8+hack+download' further suggests a lure for potentially unwanted software or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/qd4kk0ll649h9hcbujo4hqkmce/89091198229.pdf In PDF document text
    • http://boldogelet.hu/media/pogove.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/lakewidipodobifobuwik.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/91162379592.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133358485474---12470992974.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/butemivijigetovivup.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b67dc7b483fad4c219ae12df2446ff75/8141820475.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/ziroseragemakirevofejite.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/xotafofeperapoduk.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/54564572312.pdfIn PDF document text
    • http://zubrcup.by/files/files/fabetawireve.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210913_044549.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140f4493ae93---59617451409.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/26709237458.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/kor131j29uf0geef23nfso1tfm/sesozenunezudaju.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/59169132572.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48445022407.pdfIn PDF document text
    • http://shamayachts.com/upload/file/kunifaxizivit.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210921_32947292C0CAF521.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/lidozolatuvotanat.pdfIn PDF document text
    • https://iwistw.com/upload/files/xodim.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/67900272872.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/504014219.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/vefekivaxopulefi.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/wirawanuvubeliriwu.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/31899150046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=asphalt+8+hack+downloadPDF 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_off0000cbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDC 10656 bytes
SHA-256: 95fc670282e8f2e1ad10b818bd357000af293b11807637add1d95ce524ffddd1
font_01_sfnt_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 16636 bytes
SHA-256: 2f4906e9edcc0703df06655d0d5b46481ee74efdf301c2f6b8ac74290a768a8e
font_02_sfnt_off00010f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1