Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d68b1a0a280252e…

MALICIOUS

PDF

82.3 KB Created: 2021-07-19 23:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: f3b4666c4b19a746e0ecfcfb8786c322 SHA-1: 4c974e42bdb5bd2eb4b02eba595d6eb8a79596f9 SHA-256: 0d68b1a0a280252ed90eb4b128d0991267e7f16b74d7eb47e9b4715dd491ee31
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to host malicious files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly indicate the file's purpose as a malicious link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/8f30d87634d332ad6b91aef3800ca83b/xiwiniwufagedeki.pdf In PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/94800409229.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609cacd421b78---wivunetutapimajefadadik.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901a86e79d8---32259056135.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f269cf1c0e0---sarivepetatedeje.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/8761d78416b5b3b646e167c79a9d91e7/midivisenutajax.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a46a419ea6e453a28b0f877f6f93e838/23091478741.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f057a41c52---40274914721.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/zigowumimujaki.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210630044614_myiwtm.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/sajugodopiwarejenesumebi.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/77960849673.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60EE1DF2A2148.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/86815071948.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/dvq18acsuqdarmne4fsm0one8i/84347165648.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/mutidikobaxiz.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/xanigiv.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/juxatikoropesu.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/kogajibefizenupos.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3da140b3c---52451596753.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/jerazasidoxokeredu.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb28c5716---72115668630.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fae74460a---40433274109.pdfIn PDF document text
    • https://somogyplusz.hu/files/bunamosunixevu.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/4969051508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=applied+biopharmaceutics+and+pharmacokinetics+5th+edition+pdf+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_off0000db3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF354 11416 bytes
SHA-256: e1d031bf434b9af12c84738ea6dd598d1cdac7ec7e5b654653ccd331185ace34
font_02_sfnt_off00010e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E00 17256 bytes
SHA-256: 8da31a2b2646e00d7ae4acfb7ba3e37e1ff51392d4f7e62de269ec6eac688728

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