Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c0537550d055c3…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 06:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6eb0590ae8a91d224ba07cbc94c514c7 SHA-1: 3beeeecbce0ccc695e679c18fee42f506b10ff85 SHA-256: 54c0537550d055c3f70025d4b355d67abebfc0f8aefbc44133719e0249bfd865
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://gobelsprofil.com/upload/files/70200705254.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d4f434f01---familalanigasezogozupiwe.pdf
    • https://lesura.net/userfiles/file/13339149278.pdf
    • http://salamatekhanevadeh.ir/ckeditor/files/files/luzuviwivazir.pdf
    • https://officialbacknumber.org/editor_up/60662783209.pdf
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/54779212667.pdf
    • http://twapp.freshkon.com/upload/files/23778076563.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/97bee85a1ef38cba6bf5545b4d9db9e6/rusupotubo.pdf
    • https://reklama71.ru/upload_picture/77749135398.pdf
    • https://budapestpainter.hu/ckfinder/userfiles/files/somitalapu.pdf
    • https://robodom.si/files_vsebine/vusegifexerijogokovi.pdf
    • http://pololanna.com/user_img/files/43332587136.pdf
    • https://bkairconditioner.cloud4demo.com/uploads/files/33271690902.pdf
    • http://chingyi.tw/userfiles/files/41453656747.pdf
    • http://studioingtassinari.eu/userfiles/files/2824239061.pdf
    • http://adice-area.com/pictures/files/dovoguxujujike.pdf
    • https://epagneuls-bretons.fr/caningest/images/file/mepezazudavipuxuvumuriri.pdf
    • http://benetworkingpro.com/ckfinder/userfiles/files/64948249097.pdf
    • https://bandotrading.com/uploads/file/fukususamafafuvakatewuvi.pdf
    • http://infinivideo.hu/sites/infinivideo/files/ginopopigojanososarozur.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb8847858f---60379369155.pdf
    • http://clerus.hu/files/file/texuvotitijaf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=todaypk+hollywood+adventure+movies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d66f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD66F 16792 bytes
font_01_sfnt_off0000ee81.bin
f13634c7fc869b23f787a5260aa98e85fd4c852a36d53bf6a8209a9e4e86f3c4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 18320 bytes
font_02_sfnt_off00011e5a.bin
44031481908f589248eb4bf1712c7b874d87f0c3ac6c9b1a68e118b6a876e132
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5A 11076 bytes