Malicious PDF — malware analysis report

Static analysis result for SHA-256 4780284e08e9be59…

MALICIOUS

PDF

87.2 KB Created: 2021-09-05 11:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e066aa8af46c06c6ec77b1d5d8187e44 SHA-1: bf7cc74e853f1e7fa599c9c46dbfc7768ec7d275 SHA-256: 4780284e08e9be5957d50accc0ca29c31c6d7d3cb617f8c01321a39c9dea57b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect the user to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=transposition+of+the+great+vessels+pdf PDF link annotation
    • https://congchungnguyenlieu.com/uploads/files/bodarulepunumudiwiw.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/5454096557.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/d3dcd051ec52fdfecc464565d7e9d964/dajobogarakogevuwuv.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/xeledepalugurarugejusifuz.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/kiwonemapusejudaxuxi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/753b5b74ff5d8ee608d58524ce196987/xerowo.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/fisuzoten.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080599f33c16---70806051035.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/26830261701.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7cf9e7a35d---44949850532.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/79eco6uklbs9n95gk5tt9p08m3/37712658966.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a89a7b942ab---23799605512.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/59162754556.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/j77nogktldd7vcmcc65d3ot2pv/dakisaredovavewilo.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943ad213289---95244280066.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/89270474475.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/63026378636.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/golinifalifeforopadesez.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/tqqh3u3l4a1bnf32s5ddfj68d1/mitebosamaz.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d60160bc7b---36297788062.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/zijakafivimilimujajomita.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/62c700b11a441f22c3f0fd7f9c87f8ef/48185572874.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_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 19336 bytes
SHA-256: 828cd650930c7d4028452a879bd939b99a3fb956e67386cbcf8de4eaba7f95dd
font_01_sfnt_off00011e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13638 10808 bytes
SHA-256: a1120f5d6b0884ab939eaf19c84bfcd5c80088b48fe8d3e5e823ce366841a6de

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