Malicious PDF — malware analysis report

Static analysis result for SHA-256 737e2ae164390483…

MALICIOUS

PDF

78.1 KB Created: 2021-09-05 01:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e6282abef562540e5b8d9f57d736ddf SHA-1: 18824b8b09a23492a4a6c06d1b85d32a842f5aef SHA-256: 737e2ae16439048304681be76a5956864ed46ee78da3054bb6d996f39e4a60cb
196 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to various compromised or disposable hosting sites, such as 'infrive.ru' and 'people11people.gr'. The presence of 'cmdbd5r/didefupulunitufirote.pdf' within a URL also suggests potential command execution or exploitation attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://infrive.ru/uplcv?utm_term=surah+e+mulk+full+pdf PDF link annotation
    • https://people11people.gr/uploads/File/lapatokik.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/28256825431.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/0708f4496cdc34ddd7edad2e9c5fc174/74895453255.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/4614e2c48a74e9f9eaecd625a5b52842/22253973326.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/69667278744.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/44gjavfk5krdr8spdfpcmdbd5r/didefupulunitufirote.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087faca7d49b---wabumobijulelezozakawet.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/34201360468.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/3d362189d817728637a40da87ac698b0/suxozolixupamafim.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/ddea4221b1f9fe5e29fe64260f1f0d4b/pajevuwu.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/7utjnga1a27fpj9bm4k56i4255/19764924031.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/d07269bbf19612305a1a51564c37de3b/22228756895.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/jvek40ie3vrscuhngf1t8flc30/57386063710.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8484d26336---minatikobi.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/u46l0drkdrclj58b51d77tsp7d/nagegewetabulanusetuxumiz.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/16500341394.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/e2775d273b2e78f5de958b243641f29f/vemik.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/lifipediremufu.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/xokigawufebud.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/wovivurozibamegikawan.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20e56ea6fb---zivomibupi.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/xuxiruretaluruvifiko.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/56957826525.pdfIn PDF document text
    • https://retentionstudentexpIn macro / runtime command snippet
    • 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_off0000c37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 10448 bytes
SHA-256: 3b406194027808c31abd40e277be2553c86677a6adc555690c5870eb4edac5e9
font_02_sfnt_off0000f340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF340 22552 bytes
SHA-256: 426425d42f8cc02d0f2488658c0cefefdd9096b79cd68b6de8561bd5440a00c1