Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0641a25fe5ece6…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 02:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 450a19ba02c318106bbbe63d813aa3da SHA-1: 14a395b4070fbdfd2ed2ba0218e58f7cce1b9a4b SHA-256: 7b0641a25fe5ece6ee40861b9b91fd56762e2fedaa652163b9094113727d18a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various URLs hosted on compromised CMS uploads and disposable domains, likely for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and embedded URLs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b266d11214---befewotev.pdf In PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/12994579542.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/lueb6r1lgrspms5ig4kun2bop1/38425413348.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/b6eb78e538cbdccb2bbf2720f9d63d78/rakuzofejawezuba.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/80213855133.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/10002014604.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/78190799107.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/jidalesamatojawero.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/99950599420.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/46325211177.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210902142241.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/81331120413.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/vuzitib.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/25243454980.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/lawatafowofakavuxos.pdfIn PDF document text
    • https://penal-garazh.ru/files/tikevewageto.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/15280777303.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/9759010127.pdfIn PDF document text
    • https://kristinanamaste.eu/files/gazejip.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/zepabuxupimag.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/25366717036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+game+ppsspp+spiderman+1PDF 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_off0000d9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DF 17188 bytes
SHA-256: 7f60650a51f3bfde1206b6953d90fcd29f48de623aa53df35bd787018054f05e
font_01_sfnt_off00010694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAB 10776 bytes
SHA-256: b083ac6e7401c0529dfaa2c69bf8d6a55f914230bfc7b754b7a89528f49a2a50