Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bb92966953298d…

MALICIOUS

PDF

84.6 KB Created: 2021-09-21 21:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a17e79d31e0c67986836fc226790331b SHA-1: 71ee3cb2385238e91bfb8c6421cc5022ef4eb5d8 SHA-256: 50bb92966953298dc3a1c98f731a947ead85af935f1022c8d91ce64000305209
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=download+keyboard+for+my+phone PDF link annotation
    • http://sirindhorn.net/upload/File/60783984461.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/48084089.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/fovovelebefam.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/61725460490.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/59608608426.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/19192694031.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/85876490164.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/41495955424.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/36e7a713a2b90d3d54f3124b5368df70/21162805916.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/26129893564.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/66566916893.pdfIn PDF document text
    • http://glassick.com/userfiles/file/kobax.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4cdc4fe04---18154677076.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/gozojevugabi.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/13485832219.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/vofunumadob.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210908142244.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/62443206354.pdfIn PDF document text
    • https://cinemaparadiso.site/uploads/files/sadukebinafufolol.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/57979289854.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/kci8r29q52c02ib7va9nmlbrrr/naninibuduji.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/siruwogobodozu.pdfIn PDF document text
    • https://friendsofmultisport.com/ckfinder/userfiles/files/sapodamabowir.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/50731094954.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/rawokujow.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408635492d7---30573405140.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/gewajoz.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://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_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 18488 bytes
SHA-256: 6c8aaa26fb31f3be3514d3d1c24e60979be6416cdc87acc22f06f1445f077aa4
font_02_sfnt_off00012d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1B 10840 bytes
SHA-256: 9e162bd28a1592ce9f45b3da3b02629c34c832a492fb58d296ac049244272a52