Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4c1c27c88cb0cb…

MALICIOUS

PDF

91.2 KB Created: 2021-07-27 20:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20d4883e0801466851a1a22ed40c856e SHA-1: 055fee3b088f4d1cfe45c450cf6d0b2f0da9671b SHA-256: 4e4c1c27c88cb0cbc70f22793ca83a0f90afb17ff64f0577c149c11ee8f509a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

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 https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/hl0aoskbri1b4k3trjmf71cgr3/tixufefufep.pdf In PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/orc6vio0h981rsrmu843pkkim5/xixetemakojarezetepulisis.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/032c80a21889afe51f7f182774c6c3f7/pikevitu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02f5ba3bcb---21390813310.pdfIn PDF document text
    • https://ivanamihic.com//files/morune.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d95a051da0---34215905836.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/42p55u7qu322qi1jflnv2lu8fk/vijugekako.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/8081d058fabc2928f3ee9e0c3877fb08/fevodejuk.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b374d4e9---4093517514.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/wisisikeguretugalubigikad.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/sazurunotoxom.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/2938412363.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/pifukel.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210718_CE7551B0FFA09151.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/72874a0bbf8c7e19e9734d32fa1934ce/84505339593.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d274371484a26952d9a308c1cf011c7c/51723229543.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/totufeduna.pdfIn PDF document text
    • https://activepymes.com/pub/file/41063080546.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/974749177341625844972.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f34a8d6ce---kovekozifumelumenek.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e5893dbc9dc---75386335579.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f4792b7a---vuzejapeliwurukubirinu.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb56085e060---pijoromifafet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=product+key+for+windows+10+pro+n+freePDF 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_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 10972 bytes
SHA-256: 3b03e8641216828701a74a23f6e8e1517a8d8c4bd494f7adec05d11cfaba7746
font_01_sfnt_off000116e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E7 17948 bytes
SHA-256: d0005d3678a4c5b7db7cc3ea7f8ccae76d812ed8870d45048c5d77e675cdf9b7
font_02_sfnt_off000145d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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