Malicious PDF — malware analysis report

Static analysis result for SHA-256 de58fa7588b1e469…

MALICIOUS

PDF

90.7 KB Created: 2021-06-26 14:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d521036ef6e659f23cf1347fd9f4fbd2 SHA-1: e9c6a7e9a6af2e685add3ccf4aa5b034a10dd097 SHA-256: de58fa7588b1e4695ebcc60b0d3fd3a9479c17633b0665bbe85b315e81bd9293
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external URIs, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://infrive.ru/uplcv?utm_term=easy+meals+with+ground+beef PDF link annotation
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6fe1bbb5---tijamipubinifike.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1478d94e37---xonovividopipufixiwuzelam.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/4g28l2m19suphtdbfn9tc2fmvj/53190838413.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rjamoclg61tvfudeomrdtrtkaa/42249831836.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/oi2tset6mk3p2nsio5t5lhae8t/71741453153.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/gi5crtalakl35b6ojp33jnqg7h/33354522834.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/xomefufifowebawulefide.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d63123635---18736875751.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9032b2bdf---kisorowud.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85079dfc61---sisagonunewozugomu.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/41351501962.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073578478d4b---mugotofovegere.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ebad63cc7bb0qg3oiodcbou266/banewaf.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/84633749977.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/3trjvo1c26fsp6tt28fh839ri0/70787934719.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083eaf67a0c5---duwira.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/pumifozeramo.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/252ujkn2o5ufibgn9n0sg6aok8/97329896288.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160aea35309d71---8896997665.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/nfrsjc0a96q5kkmk5d8rjpv1v3/1397338315.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/13277614769.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/10c541027e89c03055023cf96105fa34/49372054735.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/pinutiji.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_off0000f9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 19200 bytes
SHA-256: 92c9539203df00f558a35e63c1542b316e193725988d946461c14174e8967dd3
font_01_sfnt_off00012b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9D 11224 bytes
SHA-256: dba2be950665ee22fcbdacadf0fa0cc4e00dc3a777218d7ef545bd286ff22d45
font_02_sfnt_off00014592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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