Malicious PDF — malware analysis report

Static analysis result for SHA-256 a509d706ff0ac4f0…

MALICIOUS

PDF

69.7 KB Created: 2021-09-20 01:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ee32cf6cca0a5f01b9e40d5b2103c3a SHA-1: f7b0f6356f5e08c4830ac7957ef48547a240fef4 SHA-256: a509d706ff0ac4f0beed4fdd8fdc3f098da09719c8549f10f566eec7ace78e14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://globalroomplus.com/bot/ckfinder/uf/files/fizolitak.pdf In PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/34171086664.pdfIn PDF document text
    • http://mayjack.com/upload/files/40547009145.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/zadazinudofazuwu.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/ruwusatakezifili.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2342c234a---86377074944.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/6207461142.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/54198919436.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/raratadulevatijufoke.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/71031627077.pdfIn PDF document text
    • http://simoncaulkin.com/images/gevusajodexipiwasog.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c55ec3f2---zobesadisigudimetanixi.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/27546131982.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/13410719242.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/samadadivedajigigusawoxun.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/sesonanebixix.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/29208120834.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/45645579345.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/84801126077.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/zokubititi.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/26117252704.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/53747296399.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/8383b85091511940b4f604efba5b145b/13122339907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cut+the+rope+apk+free+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_off0000b1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F9 15172 bytes
SHA-256: 36091c7f16cf4c6f55f1cc32d0e020560dfa717c2eac51db21dc7feb3b540f42
font_01_sfnt_off0000d86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86C 10644 bytes
SHA-256: 42f2df83ed50939c6a475d99097ed596c04c02975353f743c704b8100c6511a8
font_02_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1