Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db910c331b1d2a6…

MALICIOUS

PDF

125.5 KB Created: 2021-08-05 16:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41d9e21b3eadd9890dd7640d537e1a8e SHA-1: c46a617bb398957b941ca895e39c6a892ff112a2 SHA-256: 3db910c331b1d2a65472b4ccf76dbebe695e344be49970e3d08d695efbd3536b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It contains numerous links to external sites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://instant-image.net/UserFiles/Site/File/vuwapozuzizaduxizada.pdf In PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/a9f9fdc5ffaf0eb327a305dc787ef508/gutudidiwimefegatawuj.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/11899601685.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/75140213426.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/23350894171.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/575628568.pdfIn PDF document text
    • http://servmed.net/userfiles/file/kamuwurilubakuliw.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3848ae629---25801676410.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161073feabfcc6---lewuborebimifodemoj.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/8805093836.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ce14dbeb97244d3e77e4d0405bb31104/gexizitobotitebirapijota.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/nuvupitixesatuba.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/wuvirutik.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160815b1942b8a---raxobulis.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f79f18a3---467746222.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c99f513a9d---dexojufepij.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/qk8kca58vgm6ssbvemhq44tr9k/gutirudijef.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5d1936fea---tilere.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/mawonukogonedesovupanune.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16090e59220a4e---rexatedujilulexiwasuwajak.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0c5ea1342cfd4749aa4fa62ce334ca48/vejogilibufij.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/65063877629.pdfIn PDF document text
    • https://t2sc.me/userfiles/tojaxagefumobovaseku.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/jeseg.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/xefurevujajigudak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=french+vocabulary+list+grade+1PDF 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_off00018509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18509 19380 bytes
SHA-256: 901aeeea0f416df87dd5ac0ab702f11e691334426381185bfaf75fb1099e4309
font_01_sfnt_off0001b53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B53D 11096 bytes
SHA-256: 227ca2b5db0a525a4504281f380d3fd3c4f5faca126e4e268558a18edf99a5cb
font_02_sfnt_off0001cee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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