Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e5592f9f7f830e…

MALICIOUS

PDF

78.8 KB Created: 2021-07-24 00:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: df76fafbe8acb6cfa1a41e5e6f22e9f0 SHA-1: d3965ebd0de3cb90e394a573f935aefa1f1f5b05 SHA-256: c1e5592f9f7f830ebc22d21395b86907d7272f740816a08a11b1bdabf4912af3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that point to compromised websites, acting as a link farm. These links likely lead to further malicious content or phishing attempts. The ML classifier and ClamAV detection strongly indicate malicious intent, with the file being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160942ffc47453---faxakijisivepi.pdf In PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/gd02kec1dn8ff9urhcfij385c7/jerisetizub.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210611_F7769BB46D73087B.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/56346105425.pdfIn PDF document text
    • http://sdds.be/userfiles/file/89265461516.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/54167897981.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/fileririribefisiwovoret.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/pusapozozalemazu.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/pafobibitojufababusegu.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/99860373922.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f80e5ce92---58172730475.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/85021c9bd1828a32ac5121f37d8b7b83/44641584452.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a2c9284c---222762100.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/42633888471.pdfIn PDF document text
    • https://media-get.com/userfiles/files/41662500876.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22691b9ee---fojedazidavufet.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/81890551742.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/97745509563.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/a61360a7b269f25f14f9b46517f39aaf/30148635649.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/010bk8cdptgts1dr7qcce0v9l5/moxub.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/417799171847d6769b58f86242b87442/21453898185.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/kofojelapapajorukax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=go+math+grade+4+practice+book+answer+key+pdfPDF 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_off0000cc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3C 16684 bytes
SHA-256: ad0d89d81be5273befb13f2b034e38763a07d2ae2a084ee080edb9bfb3af11b4
font_01_sfnt_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 11568 bytes
SHA-256: 4b6060f9376e5d9f4a8b73cf6d0f035ede570c3da1751e9176e70c521acf79d6
font_02_sfnt_off0001122f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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