Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1dd1b1bcabc6c0c…

MALICIOUS

PDF

90.1 KB Created: 2021-07-30 14:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2940b20b5bc8c01bcbd8a8e7faeca3b4 SHA-1: 95b0ef654305d3aeb5cf31f86594f191f6f25e21 SHA-256: c1dd1b1bcabc6c0cb285e358ad185ea28e62b63b5251b81744feab3b0fb3b3ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm for malicious redirects. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the overall structure point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://catamma.ru/uplcv?utm_term=birdxpeller+pro+manual+espa%C3%B1ol PDF link annotation
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dd94e608fda---zulusivetazugudopoba.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e01667e24ae2e7cca41b56f4973b735d/tufikativuwo.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/vevura.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c69be79658b---dudoxobosewibulomeso.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fdeae30d6---ziloratejip.pdfIn PDF document text
    • http://voijin.com/userfiles/files/44527346535.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/l1j5039qou6he6lg5l7fg4j1v8/73256807215.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/fitovuravizepidadate.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/51720700225.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f41e3cf2f29---40122570814.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/o677vos66vvq2sqseianj691p2/penirudowaxun.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/re2i7cvg2k4gtt5g2cqe85fvcm/42301549744.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609045cd0829f---37572636127.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/8142799139.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/64845766368.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/25905591112.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/29131838378.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608604ba3eb47---16462877023.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/rixutusovepufof.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/bosojaxa.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16226847941446047365.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/zokekivete.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/cnr2u317mg5r10cukp9u2c3gf4/relupogi.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c928552a3df---gipoxif.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_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE6 19976 bytes
SHA-256: d295034ec76c3d84017b9beebd351b4c423d9eb9bab5bcc18fb1db27f9181397
font_02_sfnt_off00013f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F94 10916 bytes
SHA-256: ef0346b19fcfaf614cf2b6074a7411c12abb9046e56917df42476599fba5e33c