Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3a12052c7947cd…

MALICIOUS

PDF

87.3 KB Created: 2021-09-08 06:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a24196af00aaa50fd6fbbb26a2cf2e3f SHA-1: e1a2110a8e8b89bc3954062f244b95a9253dd3af SHA-256: ac3a12052c7947cd9410733b1fbd691fbfc8b03eb40303a8003b382e6b5d905b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, likely to distribute phishing content or malware. The presence of embedded URLs and the overall structure suggest an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=english+language+learning+in+urdu+pdf+free+download PDF link annotation
    • http://sushiloverca.com/uploads/files/dexaniruvejuferadupikule.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/7ac7073518787c65b6d4e3fa179b705b/59109367159.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/merawopitezalisuze.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/90320087806.pdfIn PDF document text
    • http://www.asslar.de/downloads/tifege.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/81539028434.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/76812495484.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608b228ec83ca---78505460517.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7281a115---vonosebivitasuju.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/88ea137de1f1b98db97bf35a64d5f5cc/81446295256.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f54e155eac0---zasokitudozexinuvedodiso.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/4405427091.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/78555191819.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/tokepaxalivumojurep.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/14da8bf6885f76ecd35d2356caa5f892/dupitavamemiponupek.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c62450b83---18757844055.pdfIn PDF document text
    • https://hojoairport.com/images/file/3412630219.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/635c805ec2fa185db95100f54edaa889/tigixatedaxuto.pdfIn PDF document text
    • http://sro52.ru/uploads/files/22382917221.pdfIn PDF document text
    • http://7linc.com/uploadfiles/fckeditor/20210828/file/16301630374216.pdfIn PDF document text
    • https://premium-house.uz/images/file/forogojoxiwutinof.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a03a1278e4---diralodetetegupa.pdfIn PDF document text
    • https://totounited.com/contents//files/90244954398.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b89adad3e---gasiwulefikowe.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/2v93cv92dpk4c3g32dag9qol6r/jidijumupizexowazodejovok.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/kopejir.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/th3qss6o1n9e0khu0k053c3g02/38268363509.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_off0000ee83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 18444 bytes
SHA-256: 976219373772781ae833bd2806b3b3800689bd29c1a3033eed3ce7c0fd785683
font_02_sfnt_off00013636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13636 10848 bytes
SHA-256: 522dd2fa961f70c3c1a8e348a481ad927f81bd7fb51d170e575784bc954cb1c1

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