Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e38f7ba29b5636…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 15:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 65c1ce4db374d901af3c38b2ac694544 SHA-1: 9bd7cfdab3104979399696ed2b002eb5fbac366c SHA-256: e3e38f7ba29b5636575c0cbfaeabfe661088b728e8fe686633af99b1d261e7e2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://huntic.ru/uplcv?utm_term=sierra+ingletadora+manual+robust PDF link annotation
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/kapiladap.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/nikefawivexotib.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/tivewejixutozixero.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/kirogepisifimapa.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/e8ea157db76a3360546cbac8fbc2f30c/7431557460.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/12869988524.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/00c5eeafc4692db211da670be3a59f74/bifuvikoxemolalav.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/faa4bf24d7d1a0346de7212383424b30/51412339973.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083559a31bb4---loveludatobowubim.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/fb46e966f93bbdd67ae0f8966f922f11/gotaxam.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/4db94fb31ce3b9da9d15b83536835cd9/27923829259.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/kovepimolosume.pdfIn PDF document text
    • http://derma-dts.de/files/file/fuxowonevogizuwaleb.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/siwolibirubabedubuzuk.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160eca847a6df4---51447137344.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/339c588940f6196f9562507127474952/xukufizinorewaluzuniw.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5925f17993---pemikufadamizemexe.pdfIn PDF document text
    • http://rpdev.org/ckfinder/userfiles/files/gagajobiwolos.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/diwan.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/zogefuritewefisapomukuki.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b825e9749c---10975115985.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855a0fadfaa---24879166775.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb9ae4324a---ridorawebunege.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23c2251419---tuwewudalik.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b4400ccc9---gapugukak.pdfIn PDF document text
    • http://iphysiology.ru/upload/83501216746.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_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 10904 bytes
SHA-256: a834984440c52cd36df9adc8785b0d113923bd97f8ccf74022d0428a244237f6
font_01_sfnt_off0000f4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FE 18432 bytes
SHA-256: 069980395178d971201d9e035fc792771e2b51ae8ea0fa3fa79b288f32750d00
font_02_sfnt_off0001252e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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