Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1882391c4a2be37…

MALICIOUS

PDF

86.9 KB Created: 2021-07-05 23:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e5aca616534b07e60b3cc49d1d4b2d30 SHA-1: ed896578e9bc616ab63aaa904b2712d779a9786d SHA-256: f1882391c4a2be3795097643e5509d193bebaf38e74bc25ab873535a488cfd9a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a malformed exploit stream. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of numerous unknown URLs further supports its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dcfa7833f---laxojepa.pdf In PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/e6378jgdft0ln9bfu5bgkjnut7/81907934948.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ca1a0c02f---26073382892.pdfIn PDF document text
    • http://batdongsandautieng.com/upload/ck/files/31550097706.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/bexezegigogosatajekuxavor.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/fowisuxemobikusudujidik.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/34b7a1e89f6a8b50521c96355883d024/35723867542.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/rovufexilovaxi.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c3768562c---1155029.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/8572412189.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20338a74f0---saboma.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/xatuz.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/q8pop1o4o9k4l0h20kkpigoqqe/gipemuruteruvakog.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/r6vmlj9qdd2o3b457cfb3q7pe6/2391980356.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16223754088297.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/uo883nn50oncplqecmbp0u172c/lesaxibub.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6gvi91if08qcar1f0pieh5jt47/kiwegonokojawajin.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/gufikaj.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/3unbt9kr3ebkgt44ml2mu2ir09/rozerolatedos.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f583a8246cb8be98fe7e14f06efc1a3f/kozowibuxasidabagibijuni.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1d69588b7---85717825042.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/basexumisalosalemu.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/54428708417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=omegle+connection+problemPDF 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_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 17376 bytes
SHA-256: 8f25a02f1a6ca0e93c3517b74cdeeb3c34ff691425f793d4c0ac2e579ab186cf
font_01_sfnt_off00011d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001354d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354D 10552 bytes
SHA-256: 5e4f6e1276d0270c5f8e77776622eed4f92e1b704b3fc4c303c0098067aa169c

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