Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c809b303ca1e420…

MALICIOUS

PDF

73.9 KB Created: 2021-09-25 23:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 346c300d06d00c1cfbaa6823c691610b SHA-1: 08bd5afe69e40dce87a805ee1fda9c545d5e4997 SHA-256: 4c809b303ca1e420679b7aa196ed11463bccefdd03bed69e8507e6b2eb05ff80
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous external URLs pointing to various domains, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://www.pattyn360.com/upload/forum/files/40827973489.pdf In PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/55562803059.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/76784535318.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/88407357946.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e004a7e07---59448745969.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/40214953798.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/zejujiwes.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/kifelirakarewebeguz.pdfIn PDF document text
    • http://nensi.si/upload/file/dufizosaviv.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/7599508775.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/zekibemawod.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/3n2165rd7v230m3fk2f627lses/vujovokexarip.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/mifomaf.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/1af690c70e7134d0f757ee3c2c80c2ec/xesizetapixekidafe.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210923020317.pdfIn PDF document text
    • http://dzbnf.com/upload/file///75083048977.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/85402758813.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/173b6e7ca9376772a9697748418c7fa6/32030750843.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5aaa4eccc.pdfIn PDF document text
    • http://sun-tes.ru/files/file/magino.pdfIn PDF document text
    • http://jonme.net/ckupload/files/kaluwowusanobuwifogilej.pdfIn PDF document text
    • http://ginkgokatsugg.com/uploads/files/buluvoj.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e297e378c---fofezupemenodiputuzeko.pdfIn PDF document text
    • https://fishuntpesca.it/file/71421590583.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/lobisesixofuxibewe.pdfIn PDF document text
    • http://gr-chem.com/upload/files/tawakoziribuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=factory+reset+samsung+galaxy+tab+3PDF 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_off0000b735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4C 11084 bytes
SHA-256: 8ffd5c1b463da675657bad9916311d46a554038305d94acfb6ff5f4448a06642
font_02_sfnt_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 18884 bytes
SHA-256: 408402be036df8373b3cdea6f9669c57f6b0a0f6923aec5e85e245a695488cd6

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