Malicious PDF — malware analysis report

Static analysis result for SHA-256 c545d495bf054ea1…

MALICIOUS

PDF

79.0 KB Created: 2021-09-21 21:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a180a3d86e35594e02bf25fddc4219c6 SHA-1: 9169c7ce0a7f1520e404cc9f50bb5102d1ba3698 SHA-256: c545d495bf054ea18fd6c7a8c22b22fecaf514303032e3856abf74b53ff71cfe
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kfnmsz.com/upfolder/e/files/20210915202306.pdf In PDF document text
    • http://cpils.com/userfiles/file/vatenepukenajudutizof.pdfIn PDF document text
    • https://baptistfriends.org/media/34037526323.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a721e30c18---92141523998.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/wagasejomujotizorupir.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/35280460429.pdfIn PDF document text
    • http://www.sunriseacademy.in/ckfinder/userfiles/files/toxobisu.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143016ce9423---buvivotasalupebavajigata.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/67432796645.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161451d0b7b369---raluraropabesugeg.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/86947346089.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/vuviguwoxamiketig.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/13943794593.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/sodanamizu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161432615c7df9---buxitabud.pdfIn PDF document text
    • https://go2germany.ru/files/file/fewotoza.pdfIn PDF document text
    • http://toroisg.com/public/images/files/85505895759.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/mexunasepukiluteduvubo.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/55641606925.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/joxoraretejedi.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/surapokotovajotibuluzix.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614776e537ce1---suxelumafi.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/rodalozesoju.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/refif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=worms+zone+io+apk+mod+downloadPDF 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_off0000d1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EE 16960 bytes
SHA-256: 67908520474a9b88f204e42f190a306ae6f03711a76e5c1950b3b83257276cae
font_02_sfnt_off00011597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11597 10684 bytes
SHA-256: 10589d86469f101cb00a057e0f10322398ceacc5715319f71fa551b3539eab39

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