Malicious PDF — malware analysis report

Static analysis result for SHA-256 225d9acba0edda03…

MALICIOUS

PDF

83.5 KB Created: 2021-06-27 23:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 855ca207e7a9841b9db446bff08cb110 SHA-1: 44b779fb76c9a3f60befd13a86ce97cd2b90e85d SHA-256: 225d9acba0edda030bcae59aaf1d40404387cad25a0d7693b0822d980b2a624b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, and also detected by ClamAV as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The document body itself is unreadable, but the presence of many external links and the 'link farm' heuristic strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crysiq.ru/uplcv?utm_term=journal+of+thrombosis+and+haemostasis PDF link annotation
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/cb5c445018d43ac32930929989547fa2/xagela.pdfIn PDF document text
    • http://minerva-collection.net/files/files/rurogixuvawokovibisasebe.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09f5f887c4---jazimuw.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/506188831fdf82868479de0d931d912e/domilow.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/o3b5mnvnl8j4ln82g21ih41mtb/kezuzubeneturuwub.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c865020bfc---faxemo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/32v1029hap3s0s83727p5e3er0/misiwodeziwe.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/tuputo.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/1e4357a0b05184ccd9cb8052e4d304aa/13593298001.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/gg9p2i5mseb0g13pt7lv3c0ur1/rezuwipunof.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075ddc674e46---figitapapebobadagikarapit.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/9mi9allc1coftmhs3v376fkdn5/63980520765.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b6ab03f74---sofawimuruxabusedoje.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/4r134ced45rd93ae2a46lbcioa/nozanamifavuzituxusolad.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5e7c18f164ba110e7edbdae9152af5da/39664527382.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b40b0ef07a4---gututuwesakenitixugatifur.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210604_FD5C6C3484926CC9.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/56806567690.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/cf97010d20a67f1235801f305dfb7315/30506321618.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b1d3bfb3---kajabemeduzinizova.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/21716975484.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16090723f9b9c7---23434524017.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_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 18456 bytes
SHA-256: 13fd7915a5c72529493ae653c3b395dcebf10e28b289d62adbd759feec2e03a9
font_01_sfnt_off00011003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11003 10852 bytes
SHA-256: 7caea10186d67c2f10510135a9e47d117928d3fe9fe2957c0a87eee776b913b4
font_02_sfnt_off000128da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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