Malicious PDF — malware analysis report

Static analysis result for SHA-256 72036bb704a0f333…

MALICIOUS

PDF

74.0 KB Created: 2021-09-26 07:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa053aa4c92ab0b55eea0078baed01d9 SHA-1: 4d6133c2a19af875e267433a36352dfb01fea582 SHA-256: 72036bb704a0f33319c7ea232f1cee4b0218a2633af8ff2981251cafeff9dab7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs and heuristics indicate it functions as a link farm, with some links pointing to compromised CMS uploads. The presence of embedded JavaScript and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. The primary lure appears to be disguised as a software download, as indicated by the 'utm_term' parameter in one of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=download+enlight+videoleap+for+android PDF link annotation
    • http://divapharma.com/uploaded/file/mogofevusomezevogesuzove.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/zunixuxutefamuwatijemena.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/35822423121.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/74770902468.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///19823820324.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/5613153735.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/mojowaxus.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/28984924346.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/398885dbb4e7f68403b01d0bd383a096/dudasepozagofixenaputuni.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/likugivomokexugakupuduzov.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/mezoxalorodazogofopozarux.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/1a3108e336d5d6dca8627e05f123dbe0/29413584603.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/lerugepifefopusin.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/41883201412.pdfIn PDF document text
    • http://vtaky.sk/media/file/74424217456.pdfIn PDF document text
    • http://chikatere.com/Upload/files/40511348284.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/98791928389.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/kewokid.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/40251402344.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/87232831622.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/42945533113.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/9eaac9105250a7e39641bf881ae4aff3/zovejusetilik.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecc04b20f---kepijarimewegoxujogew.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_off0000b8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EA 10764 bytes
SHA-256: 8e7be3a16b5899f55fae17938c999b2255bb81df10db0a4179eb5bdd59b88bfa
font_02_sfnt_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 19168 bytes
SHA-256: 689565de76b9de1b8593cf4ecc39ae5dfad956c5753f1b012a0c05a94c6193e7

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