Malicious PDF — malware analysis report

Static analysis result for SHA-256 999a30c5f5304dc8…

MALICIOUS

PDF

73.4 KB Created: 2021-09-07 23:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b8ca38e5a1c44569e07a9c01e6d1f1c SHA-1: 4098a542ff57b27a375925d9f72fe3bbaaa4a343 SHA-256: 999a30c5f5304dc873ec1a2ec4286dbe8ca94dd5644a933f7e4c1cd73cdbd9cb
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are hosted on disposable domains, characteristic of a link farm used for phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://alperbehang.nl/userfiles/file/gizukorabimidabubopenakov.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad58ed5cd06---81940866694.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210729_175305.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/22436679032.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c947db9809cb839ff81aa158917ae07b/wepigor.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/19937918663.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/vewivibinikegobi.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/22576586514.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/96ovgsgghhj8cputoqco8p1rqo/39044398853.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/n9tc9ci0cp49ql8ieuifikajkj/wanafokalafaresikadoteb.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c9f9057e963a0c01633b59fbd39917f8/51421212769.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/1f2cfba510d69cf9e0c78aa615e172ab/27157151217.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/16570564599.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/69726397079.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66f5ebf560---soterafezewoxidizuretil.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/ratugotomu.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ggoikm24nghia6r322asc45n9j/tunaxasonibavubi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/c11d5179ce1766d4ccfd6344c927bb3b/banewokaraxun.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/bisamugitonepixokunowupej.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/76425301038.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/gafalinoxafog.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082996e45d7e---bojosefilifaxu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/64659438248.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a321e1ec66---24774818551.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805c3b464e3---sejikixizoban.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=renishaw+easy+probe+manualPDF 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_off0000bce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE6 10904 bytes
SHA-256: edda0d3ee04ef64abb985450b9b629c11b4a3324dfb2366d9da15eefdbeaf47d
font_01_sfnt_off0000d5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BD 15792 bytes
SHA-256: 625dc8b97241e79a778d59b740f8080a2153ab79baa5be18fba9cf09b9a5695c
font_02_sfnt_off0000fe5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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