Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecaa601748a694b7…

MALICIOUS

PDF

95.0 KB Created: 2021-07-17 23:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f79219df753c99acfc8c41da5de0f14 SHA-1: c00b3f0b3624a163709394caf37c48927bc25439 SHA-256: ecaa601748a694b77eb098f03e220b52842b2e27aca61a857e063842dac42ace
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://classicalgardenstatues.com/uplds/file/zagebuzo.pdf
    • http://uniroll.pl/user_images/file/ziguvanowavufajanujeworol.pdf
    • http://booklandbooks.com/userfiles/file/xugunugotasaxo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083471930e9e---lipetijizunabu.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7def10786d---2824481453.pdf
    • http://hungbuloon.com/media/ftp/file/44148822295.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16092ec424458f---46921211458.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0eb8944c89---3539550718.pdf
    • https://curvy.tw/upload/files/15044476767.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbcf8d3f62---dekekederexagixexa.pdf
    • http://americansemitruckparts.com/d/files/kojerevijozaga.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/ad68e6c0c77976907dcfa3a9e95df1d3/kutiseler.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2f6abd7da---nuzad.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3b42b6db190c55c298dd51f8fe90f4c1/velowa.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/6nged8t1638p2knq0ibrpgb6sm/83286343020.pdf
    • http://poltinik.ru/userfiles/file/61867776575.pdf
    • http://automsystem.com/UploadFile/file/20210516194813888.pdf
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/lapofupasutojigerezusuj.pdf
    • https://pet-fashion.ro/mm/file/83466074593.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/acra2dcsrft36r4rv0m9jp63cl/dunutuvavul.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/b02aet8p3g4iv4kb8jbvji2tea/dawokasej.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=skills+for+occupational+therapy+resume
    • 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_off00010f6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 16792 bytes
font_01_sfnt_off00012781.bin
4d32594a8f0c467f949f4ef92588cf10883031fcf664c544281a7c732e5f8565
pdf-font-stream PDF embedded font (sfnt) at offset 0x12781 11128 bytes
font_02_sfnt_off0001414c.bin
53307945623725a629a10d52b976df02ec84b1606ff5cd9b075f681e21572bc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1414C 16748 bytes