Malicious PDF — malware analysis report

Static analysis result for SHA-256 735c46e3731616c3…

MALICIOUS

PDF

96.5 KB Created: 2021-07-02 17:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 813bd8355813eac99be1f0a7f29d8675 SHA-1: 48e63e8004b26d5519a6eef0c992aaefcd2827a1 SHA-256: 735c46e3731616c3505a8720228aa893dd9f7ef10fe3765d828503971e4cc8f1
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many pointing to domains that appear to be compromised WordPress installations or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d70f8c1fb---fulazemodezo.pdf In PDF document text
    • http://www.anjhimayath.com/upload/file/kitogepoxojejalizu.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/69310163095.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/95486519590.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/diwitijofiranurekeb.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/37cdcbcb94ef8bb1d1d80dd46fff220e/73481305974.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/82808073490.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/wujetiroka.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/c4svjs9fqg9eo104t556nbm4r5/67909153923.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba04cc909e2---53764209674.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/3167e27bab31c0c082c5bce50a64b083/tojinog.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094db0a5475b---14566687011.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9aae9cb4c---30840481359.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/vadalonovopa.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/munurirajop.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bb52ad8e5cc---44023698665.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe16233770---53032513263.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ur3aitvuf7i5f807lskpoft2b0/51937697275.pdfIn PDF document text
    • https://energooptima.hu/upload/File/87693516141.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/82058532550.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/91a534ff06f3bcfdd7ea695f334f03f1/42114292882.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a02f48f3351---wonenobusemarofoxipifanaf.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/gginjehft98n71km3pa8e0m147/gifera.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/kixatowokuvaj.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/7363086237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=name+of+the+autobiography+of+nelson+mandelaPDF 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://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_off00011a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A56 11276 bytes
SHA-256: 64dec52c61af6e237a443594844cc41e17d5bccbe73aa6be2606d608dff57880
font_01_sfnt_off0001342e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342E 17136 bytes
SHA-256: 20a3ab9166d739d43b404e503a2e5e8a77ac885df56761617d5aed50ac17fdc0
font_02_sfnt_off000160d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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