Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f45c25cbfb50eab…

MALICIOUS

PDF

71.6 KB Created: 2021-09-18 02:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c8f5496665225f924d4da957f168b97e SHA-1: b8dad9eda9acdf072e24ccba6938d8a2ad3ad4ab SHA-256: 2f45c25cbfb50eabca1ab2fb603287c4d7fc1e248da429a31f814c9065af3e20
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links and the overall structure suggest an attempt to lure victims to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chinalabware.net/d/files/31874002458.pdf In PDF document text
    • http://stonestudio.pl/files/upload/file/fanatinebepefubazugevilo.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/zivonapuwinamosi.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135246f0baab---17195743638.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/xipilinefozopipaserulif.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/69023062659676284c99a3db8c6dd2e9/80209357196.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/bipatibopazum.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/277372464.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48500428565.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/voraxulezobubipikuvuvave.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/49565811761.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/wameterefigeg.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/pabejopijabazeworir.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/bifuzos.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/sipanote.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/66418815807.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/pofaxamabuwakuzesef.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/bodomosefatezikukateror.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/divamuvozuremetu.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614492c32fa61---71598217128.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/84220825784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=internet+speed+up+booster+apkPDF 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_off0000b81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB81E 10528 bytes
SHA-256: e5374e0ef3f726f0b425ecc87d7f6e558153eef78814ece01f214b5b2308709a
font_01_sfnt_off0000cffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFE 16140 bytes
SHA-256: 5e84eb87795635c34cff652df0f15ae0d18552c6b329a2f8f06c53ba067fe21c
font_02_sfnt_off0000f95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1