Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62383b3b07b06d2…

MALICIOUS

PDF

95.7 KB Created: 2021-08-09 01:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1c5edc58bb59aaec620db32eb47b3ec2 SHA-1: 87243204ce31706063151d5bd6f2384c7b431df5 SHA-256: a62383b3b07b06d294f125ecb85d3f73084b64baf9778ad62be4d7dc4589cef0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://led7.ru/file/37213288177.pdf In PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/48842946065.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa065131d0e---38758171990.pdfIn PDF document text
    • http://shesob.com/file/files/18930163554.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/pevulesufowazumegakesoluv.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608255347f28d---pupagojubufedigisuwuxudal.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad5b8056a---nuzimudesufi.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2fbae33c7e02af833128475ba8ad6a91/63737470798.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/tqptc5lhm9onoa0au3qi67qvb9/92393359862.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66f0bd350---71420375540.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba6190db4---91345976414.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c666b76a---71082925331.pdfIn PDF document text
    • https://tonitomov.com/picture/file/vopojaliwozu.pdfIn PDF document text
    • http://accronline.com/userfiles/file/41824735975.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/dein88bneu3l5vs76mh8tjhtam/kedolumobojifovivanad.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/baralefetesa.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/59452712482.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/neverazavogajoniwu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b929d6fa9---zovivunezije.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/na86bbpomqrspj1e45p2gdndl9/51823804406.pdfIn PDF document text
    • http://timebymtm.com/upload/files/nufiwafanulawudapiladozo.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/6b10d34902c27236bc612c197a55ba64/77676078647.pdfIn PDF document text
    • https://sanidom.pl/img/file/81310245620.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3b90285d4---18163332385.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/7iufc0acomebcjkti72bhm84ob/46994569729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dbz+bt3+ps2+iso+highly+compressedPDF 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_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 18580 bytes
SHA-256: f06ea003ac21f868bba37d7fe21f6ed18b78de790a46d070155aeb730ac3aab2
font_01_sfnt_off00013c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C96 11300 bytes
SHA-256: ef82ba76d3f433bc848b8ef6b810e6aa78961a27471d35d94b7e2de89ccf7932
font_02_sfnt_off000156e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1