Malicious PDF — malware analysis report

Static analysis result for SHA-256 a902ad21ebdb84a8…

MALICIOUS

PDF

73.8 KB Created: 2021-09-01 13:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bcef5ba0206de34bc6d2c48ba14399c2 SHA-1: d32d0e672f61603979cba4fc793acd5d72f4b971 SHA-256: a902ad21ebdb84a8fffa47221cdb47d62c5a8912a4e27209e41dc6a594a38f0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites that host further PDF files. These links are likely used to obscure the true destination and evade detection, ultimately leading to a phishing or malware distribution campaign.

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 http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b05043b1a---pifepitubi.pdf In PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fc5bd074c---kulijulusozepi.pdfIn PDF document text
    • http://omg.su/upload/File/mirufara.pdfIn PDF document text
    • http://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/vokus.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/somorurunutuxusiteran.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/778ffed61a021df934dd09a56b1de086/54316993493.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/93230328543.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/zuvexemasazumomotu.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d5a62fcb---xexeviwudiza.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/d5a5ef32d64f277f0261c1a42afbf3e0/29912869498.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/abec5f038aff589773182d05e918b17d/vesedexudovananavafagerex.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/luxepewij.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/xuzakepenor.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b7f8d96bb7224ce0ca2336025cb5539f/54494107213.pdfIn PDF document text
    • http://markone-tools.com/upload/files/60700556670.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2974722a0e---xowexutijejafezepaja.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/94140492578.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1832658fa---jejavegufufawipasavadud.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/2272451d7e29c654df7d243a2941aac1/lozadojivamakaxakemoxun.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7543a0000---59464025168.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/47022398084.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/9ffbca3c72fae2b92b129d2f8203281b/jegojemanawimibala.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/89716285832.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/modikazotawafegotufukiwab.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/980dab8206637a5a9f12e67b79f58845/damebuwar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=do+herbivores+eat+insectsPDF 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_off0000bed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E8 10488 bytes
SHA-256: 3774a1e4cf39be24a8d13ea9320fb9670532f31690fe48979f4713251ea13ae0
font_02_sfnt_off0000eec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 16552 bytes
SHA-256: 3e4b2a7027758d65bbde266fca17d6990dc6c5f118b0202a45040c2dd422c888