Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd770d85902e91c…

MALICIOUS

PDF

86.3 KB Created: 2021-09-03 05:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f37f26a4bc06f609d4bb65e212e9b1a2 SHA-1: 0f78979accd1c932626aa7905c69b0537286b1ca SHA-256: 1fd770d85902e91cf225dbf229c615af1d4ba3c47f64f2a502852f6f3db6990d
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to lure users to phishing sites or download further malicious content, aligning with the characteristics of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=auto%C5%A1kola+testy+v+pdf PDF link annotation
    • https://eccdc.org/application/webroot/userfiles/file/banilakodu.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/s2t1fs0mp0cohi1urjlamllre7/nozepurifa.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/76329958314.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/35254453372.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/56667967292.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4f941439---wafolexuseve.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/68d5a239e369ebfe632a81b7cf0d1ac4/surekiseware.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/99375721094.pdfIn PDF document text
    • http://clingac.com/d/files/18471117221.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/neferi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7eed4c7c5---13167503670.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/95754149593.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/22490444413.pdfIn PDF document text
    • http://kaies.cn/upfiles/210627014332349535kj6tnr.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/15019311309.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/77417772391.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/xupizelu.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073154af26be---waxifaponegotalunukijoge.pdfIn PDF document text
    • http://coffee33.ru/archive/file/bevarulajixodo.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/69742372446.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/mupiwosali.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/48826768786.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/82656fae1da805e603713c5a07ff1801/47670156744.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_off0000e839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE839 20428 bytes
SHA-256: fe4255100bd660aeaa6d739d29cd960b21eb3c1a1d562b553371558597882154
font_01_sfnt_off0001199b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B2 10740 bytes
SHA-256: 39e37c6ed96235c06f70bb660f93d92a51d0722a2eca9b8fa82b9626451c08a9

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