Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7540d4453616b61…

MALICIOUS

PDF

121.0 KB Created: 2021-09-05 08:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: da026fbe244544f5f37a77d761063fd2 SHA-1: 6d3e4528ae79d8486656c5f350c4f122951f39e6 SHA-256: a7540d4453616b61c3be80a8281197e0ce1edcc4e317f1872c93b05731f46ebb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612657f21d30a---99561610667.pdf In PDF document text
    • https://aterhesseg.com/up_image/file/femirofudupomep.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/niragatapu.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161121b454a574---3436426037.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b422c87cb44---35424439462.pdfIn PDF document text
    • http://elitacasa.it/images/file/39463834511.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/sotuwazutuwam.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/p6gp69p2nkjoc8t5ut3emqrdu3/30795402811.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b861c5d8c---69207514983.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/25f83754e22bb5302d9853657f79c510/dalatudivojosesusi.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/lasefevamula.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/76805458612.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/tuzanutajusir.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/forarugarajibomonapulejos.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/85410345174.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777b441a732---koposavexulororabi.pdfIn PDF document text
    • http://akademibt.com/resimler/files/zujufaliwafebuladevejufar.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/93943084031.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4457be26a0.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/74634317216.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/34835199414.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/jogolitul.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/82794213515.pdfIn PDF document text
    • https://novsport.com/content/File/vexuxixazekuwaloza.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/gazepenugamowobezase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=my+experiments+with+truth+mahatma+gandhi+pdfPDF 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_off00016d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D62 20612 bytes
SHA-256: 60db6df56bb0da606e0f8359a7b5e2a459c5b168068bc5305154bad3c092b3ad
font_01_sfnt_off0001a3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3A4 11176 bytes
SHA-256: 2f401fb092592469c916c811af2bf3fc9f11f0e29a2cd9312c590c9d372f31e1
font_02_sfnt_off0001bd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1