Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0dce399c5cf3ca7…

MALICIOUS

PDF

98.9 KB Created: 2021-06-25 19:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffb917aa6014fd2364fb372e8bc5c6d9 SHA-1: 569905add3e095c6dbdcdd4f389f16987459609a SHA-256: b0dce399c5cf3ca73617aad092fbb3e83304aff8210df206b6e39b822d46140f
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. It contains numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links strongly implies a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://garglob.ru/uplcv?utm_term=stage+one+of+photosynthesis
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a89c89b6b---gugebaluwokixolejazu.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608631df3cfa0---tifomafulasa.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/td85rs8tbsvh322scktc834jnq/buworubibawutavede.pdf
    • http://apexnepaltravel.com/userfiles/file/12716224127.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c64ae969bef83763a171526dc02a0ec4/68469061285.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607120e919a88---jatagukegafivor.pdf
    • http://goodmix-psc.com/userfiles/files/2268315145.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/sqbosgqk59lolrri1v4q3fn4i3/13195487544.pdf
    • http://itkaufmann.com/images/fckimages/file/wigawafowuwoto.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/tr1um8qqruanv99i7a269u6e52/ruzulagorinarigalonika.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/081eecc1336cd2f131fc12914e77166f/43656931075.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/a582629e8dab2e7b57c4e73d65026906/gibemoxetalon.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/7a5d35a49d57e41fb19d579d4c615a5c/matipuwitepebazuzosomuk.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90095da1c---43335736664.pdf
    • http://thunderstar.cn/userfiles/file/20210531123732820831348.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607830e6d90e2---bilarozuretiruseki.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e10872d9c---519807984.pdf
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/2638800675.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bba6a6c29eb---17554810798.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/fbc602437eb87f684a282dff02a94b6c/modifatejitomelaloruk.pdf
    • http://angelescare.com/userfiles/file/zesarikubuzepaxososunapux.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b6bb66b534930726cd0669ef82d20d0c/molukodeji.pdf
    • http://aelma.com/sites/default/userfiles/file/20416976128.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012138.bin
5779294933dfeab18397409ed9531895242368fc054de4b62c66b54d8d13756f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12138 17128 bytes
font_01_sfnt_off00014e14.bin
1e975398fb9bf64303b2b3315329da7b0e5bfa0e06494cb023a6a562060455a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E14 10680 bytes
font_02_sfnt_off0001668a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1668A 16792 bytes

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