Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2784c164fbbf3fa…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 04:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17ea45026fa91dfdceca2bd592fb3156 SHA-1: cfa7d75c21c77ac7ac42111ac306460bd3ad1d78 SHA-256: c2784c164fbbf3facc89348b579dba8b641726ffad3294dd91c8d98212ac4c71
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised or disposable domains, suggesting an attempt to redirect the user to malicious sites. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=himanshu+pandey+organic+chemistry+solutions+pdf+download PDF link annotation
    • http://masan315.net/board/imagefile/file/84258180643.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ea9d3c67b2aead95e5be3018b21fa822/waxemanilokugapukom.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/29121692625.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210602_3310BA600EBD3DD9.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/tnehsbjgva6et2rf9mvtharmf5/rogikuzujex.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a59958b208c---pifesazigubam.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/46645060903.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781062d5085---14759966599.pdfIn PDF document text
    • https://megashina24.ru/files/files/tifotagemezurafibozurifa.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16097cff746468---54430006526.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/63164077730.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/17952815443.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e3ab960b553daceb4c0506755f3e3daa/58698019433.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a95bfa86ce3b1e1c71af7bd5f8a105e3/tunurevakivegirebem.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/96b617cbc3b2e7c7472d5907063c5190/23333952150.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/c5e73976f682a9a5bffb9c1874c01934/dodumagatorinoxigosoba.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/8713233427.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/82243310640.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/85f95f85147599a03713a57ca5076481/ximoxonax.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112df4fa8f68---sofapefakaxuwe.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/88152117540.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/3172083419.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/10713254334.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38cb1af9d5---23986927008.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/37411453091.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_off0000d43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43C 11360 bytes
SHA-256: 74889564b746876bf8a4aab58e6e401aaf72dc1774def16897833fbc9c5ea08a
font_01_sfnt_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 17796 bytes
SHA-256: 9aaf81df8b2a3dbbf6ba5d4c4a9438bf5c0142c42f52c8abd116eab691427e78
font_02_sfnt_off00011ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.