Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa54ddcdb75327e…

MALICIOUS

PDF

80.5 KB Created: 2021-08-09 02:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d3aef5e75a8bcbfed74998d64f09819a SHA-1: 3f83169c63e5efeb4f530b9d231f12fd093e7c44 SHA-256: 6aa54ddcdb75327e5167ed53b2efb4fd87a439508f26f0d3881201969a2154dd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://pinturasoltra.com/images/slider/files/58921346586.pdf In PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083191c06c39---lovinekejonolut.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4983ee26---suxenakovi.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/2fb41b59b6fd39a0c704c7c5e7587d3e/nepirotexejopadusal.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/60837370129.pdfIn PDF document text
    • http://stasta.com/userfiles/file/kotebinamawinivunegu.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///daxajiduzixitemixaz.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d144536732---7838241658.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/nijotudademamep.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/60712113142.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076743fc81fe---mabuwunelakenijiwareru.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/580dab247afc870d948c287a260f5ecd/lulonudevavabodureziw.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/77551766955.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/66745315802.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/82271633314.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/dafb31123d6dd945c1865cd70da3364f/tarokixosamituk.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83672effd6---64076402675.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/72699786953.pdfIn PDF document text
    • http://pololanna.com/user_img/files/58866932942.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/gekepobow.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/a3c2cd7eb8beae879905b4bdddfa416d/66882878876.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16103aefb7ddb9---29402183160.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/12b7233e049055f063b16c038db79487/29169919345.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/57039671289.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076f54f2d957---rajakezexonimerizosimerep.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/rigesivivofeno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=c%C3%B3mo+est%C3%A1+usted+translationPDF link annotation
    • 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_off0000d36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36B 10856 bytes
SHA-256: ff778db3cca7674ac6076612013e4579a0ef1eb6a2d0ffd78c0e14bc6fb49070
font_01_sfnt_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D9 18200 bytes
SHA-256: a4b6aabf8e490f5f0977ead40db5cfd59fa5d2352b31e972c4dcad40b07136b5

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