Malicious PDF — malware analysis report

Static analysis result for SHA-256 22eee5c3382bbb93…

MALICIOUS

PDF

83.7 KB Created: 2021-09-14 16:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 588f565240a327973c87343e08b72c8c SHA-1: 15c3c51b9bbc1d8c2a37c51aac8e6087c3988cea SHA-256: 22eee5c3382bbb9301aaed60c883480bb4b118f42da1989a7c5dbf859c2d3a0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on various domains, some of which are identified as potentially compromised CMS upload storage. The presence of these links suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hrzservices.com/uploadfiles/file/jisipolowaluzixaxerati.pdf In PDF document text
    • http://nfc-lampang.com/user_img/files/vinudakaminisulesel.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210906203055.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b7nn4o6d37re9q8k4pqreqgfp/88492943496.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/kanugutatuxafejurolerun.pdfIn PDF document text
    • http://rayanchem.com/d/files/sogowamofafevipo.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109141022345687.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/45730680468.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/fab0efacba9eab8f12f5219a422a7eec/ravivodinuzopegukulibuli.pdfIn PDF document text
    • https://signika.pl/Upload/file/fivevaxala.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/63467937690.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/87149483623.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/xafixakuwamaja.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/17357891275.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/nesimidezu.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/73257143870.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/15652978782.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/50896976122.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5h93gvn8ibdq2mui8vvr2vsal9/defuzulupefimerobidotar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132047b84ba6---wesutolivina.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/bigexekatofileb.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/bisilalidisevuzigopi.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/88172900963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=dosti+movie+oldPDF 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_off0000e250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 18480 bytes
SHA-256: 985544330527f76d548395e8c04d3dbcc4a3afd641c473ea01a8539de64b8e1f
font_02_sfnt_off00012ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC0 10112 bytes
SHA-256: 1c11b2160aa89f2a8d7ca679d7e2db4779bfbf8e588e9be1aa15a09987e82c21