Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cc51d183f0f6b1…

MALICIOUS

PDF

84.2 KB Created: 2021-07-07 03:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8e8918411cd68cb29ac8fce1a2612c41 SHA-1: cd67a08b3abc7be9ec050dc0f336824a8e63437c SHA-256: b5cc51d183f0f6b110d56c1b8821c86e51ed0e1eb54016a6c5b3b719d32e5d23
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress upload storage. The document body is unreadable, but the heuristics and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://buyyoutubelikes.com/ci/userfiles/files/23509619725.pdf In PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/278995962857b51b0618c3bbcd8bb5a4/gimifufixudevalaw.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/69648683237.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607711f34104d---85540200723.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/2ef20844c199404be0d5edaa0ce6bd3c/48490239861.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/56022093096.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/3774dd017be22290f3c9bc1a2939b20f/40308686182.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/vnq0lb19fkqrh1giu0kqgf937h/55878603750.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/foleku.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/dbd9356106fb8389bb31407ed3075037/32987915061.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/81f79aa85ead696891c9a63645ee4736/xunurutokebugegidazefewe.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b152c0cd6---18758071196.pdfIn PDF document text
    • http://newo.ru/files/files/92592522671.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/rekimubozunirorelepazodu.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/vasezowezoregeroduxuganur.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16079b3c8175d5---78863919396.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/19908779484.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/jexazidapakav.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9aa91e82ac---jowalivelit.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988cf56c822---75832065273.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/eium18tp4k0hvssp74nttid4j1/67582827832.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/5btbe6mi237e69bq5d57bdpoq0/vizoxipoxipeto.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d430c0b5d35---wutofonakalotajejesajetev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=you+lost+me+forever+quotesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 16328 bytes
SHA-256: dee489d4a14e579d9212841026f420c0078b0daced5e0e75183c6b043515a696
font_02_sfnt_off00012af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF8 10312 bytes
SHA-256: e90f04b56fdea8644ec5840cdec87d7a823f840fc1b151f10e58f4ad16dc13bf

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