Malicious PDF — malware analysis report

Static analysis result for SHA-256 710e69cd95bc85a4…

MALICIOUS

PDF

69.7 KB Created: 2021-10-03 01:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f17a6aa1b514baaefe64d665c194166b SHA-1: c9c434cca715f0b6521326d219155bbeb93aedf8 SHA-256: 710e69cd95bc85a440f9f60029f958a71c6f8efe11827d4a6ea9a32c9fa4bf95
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, and contains numerous external links. Several heuristics indicate that the PDF is a link farm, with many links pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are the primary indicators of compromise, likely leading to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://irlanc.ru/uplcv?utm_term=last+day+on+earth+bunker+cards PDF link annotation
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/63561690417.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/47370823659.pdfIn PDF document text
    • https://deepex.hu/hirek/files/fusodobo.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109030115411009.pdfIn PDF document text
    • https://htchninc.com/d/files/61452248843.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6dab88d88e486da182c3825fa2e05b8f/51590109358.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/89770006702.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/n0fsr55mg99i2hrabksp3kd56l/22619417405.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/kegunekuluranuroz.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/tibenu.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/40627451840.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/pumudegiloj.pdfIn PDF document text
    • http://belean.pl/userfiles/file/tosewubasenaziv.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/71426737047.pdfIn PDF document text
    • http://rapet.hu/files/7078411462.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161461a3b7ff03---60076578151.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/bipadoxukumaze.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/putazedexigadituxi.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/52963636025.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/49574381317.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/dipazekego.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/65021419960.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/72934630568.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/kolufivokonopuzurasofomo.pdfIn PDF document text
    • 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_off0000b083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB083 15972 bytes
SHA-256: a75e43e4c40ec9c3c07cfe85694c4ac2288433c255f84699392a28612587288c
font_01_sfnt_off0000d892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD892 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 10732 bytes
SHA-256: 37a303bc3ae1f97d1d0885a39ca2fc2058058d11cae1f0878f57de70c5b56f56