Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f782424472b794…

MALICIOUS

PDF

94.4 KB Created: 2021-08-19 09:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 40cd40443998be8293c0c52656cc9803 SHA-1: c9836f29746e22ce750071c3a94d99a4684f69a4 SHA-256: 43f782424472b79493a829ee5a5782d3c025ecb69a1522d99028b92331563198
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination and potentially track user interactions.

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://synerhu.ru/uplcv?utm_term=partituras+de+canciones+infantiles+para+piano+pdf PDF link annotation
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/jvuihdro14676iub1v3urgeaf1/14475956629.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/sigodibiwokojasikesikupij.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/8mhcgtm2hrd4sathvogo66fqa8/divedasiraxe.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/movowulodazo.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/nuzujonodu.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/bapagaretit.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/24180796413.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/tawukanajiros.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/pojuza.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f788c32420d6a978d4632a7d1b0dd7a1/zetojune.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/86471147468.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/jolugeridi.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d00d934e6---28236172035.pdfIn PDF document text
    • https://noddy.nu/images/file/7751477643.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/80b0e34689373045d6fff926231126bb/87307705561.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/35e11e3d4ddf1705a4bef78237277178/31552506975.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/28310b4dd6f3e487587ec4204150eaa6/6731357480.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7af7703d20---99700083136.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5837c4d0b7---jomasoxeduvulunaj.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/85508107461.pdfIn PDF document text
    • http://abnicum.com/files/file/79818017699.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161070e5a6637a---82610080273.pdfIn PDF document text
    • http://huiking.cn/uploads/file/080033242204.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/50012719000.pdfIn PDF document text
    • http://buildinggodskingdom.com/webcms/file/dosalanugibiguze.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_off00010891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10891 10712 bytes
SHA-256: 67f7b0475b2aa0c41bb558c3a5abf6524322cdab8ce9d76871caf65a7ee8c8d1
font_01_sfnt_off00012148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001395a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395A 18708 bytes
SHA-256: 36ba399e657ec49b9006cff16b59bcf04b0c04f7d90de6b068efab006951361f