Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdb02962e194d3e…

MALICIOUS

PDF

90.7 KB Created: 2021-06-26 04:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c18d6c1ca7ee4b42acf2b1bfa20e13c5 SHA-1: 52f25e410f5050f92e6ecbd8a3c282b383bd76e7 SHA-256: acdb02962e194d3e64f12aed0f12b0491ae214753da2eb8afe73ffbf220d625f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous URLs pointing to compromised CMS uploads. The presence of these links suggests the document is designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ab936b164---kebujekugoroguzoxatu.pdf In PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089925ecfdd1---zetenewuroluresef.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/sazirutezipijelav.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/838720eb6b3dacf6da04c823b3a0da24/42995470443.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/28940a064f703af31b1e454726479d04/nabuv.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bed55ff83---tapowefetixo.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/jebodosavodotematirop.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a42ca123c19---sujetujofobu.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b29d87c55a700ecd2a4c3deb4f032fe9/kobosuwokemojimekigazen.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/gizujojepatijukopaw.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/6152147607.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/ropovole.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/74143301619.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160779bd666112---53548542158.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3495df6c2---zavatiripekuzu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c7eba8134---fixokovulirowarosati.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16087cd363ff57---xaguxisonuso.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5fa13a1cc---medemopilipibetamiwudib.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/5107762246.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607482f256f55---84822972369.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2b5a9a536---fiwewuv.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1dfb935ffc72045dae06d19a4759a52/62759445438.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf8b15ab3---70248917400.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/salejanabodofukisiwoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=treatment+of+stagnant+hypoxiaPDF 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_off00010043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10043 16968 bytes
SHA-256: 45dd2ee5cb85a1d8725510813f20fcbcf5c42b26e873b98b0d56bd759fbc28f3
font_01_sfnt_off00012c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001449b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449B 10940 bytes
SHA-256: 588d34ed2a0afb5a50ed45847c3985b944ec87b4f97dc798ed2be06d68486db2

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