Malicious PDF — malware analysis report

Static analysis result for SHA-256 a53e2b77e8a3f58f…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 20:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b157d37401505d85a2e30dbaff6d75bb SHA-1: fe23f836c087b5a17468a50ee5d5ce3311995b5a SHA-256: a53e2b77e8a3f58fcd0d2ad763fb30956fbab618a53997ee6d09523a8f7624e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=nextech+1080p+wifi+ip+camera+manual PDF link annotation
    • http://palazzodiaz.com/userfiles/files/69631503279.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/6489429727.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6b12cc58---latusajudulof.pdfIn PDF document text
    • http://runo34.ru/attachments/file/visazorovite.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/22218222795.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/vawuruwibadowokene.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161306872c7d1d---kamekax.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210904060152.pdfIn PDF document text
    • http://wirheiraten.de/images/file/39228855035.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/gawidomim.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/jitogulekaj.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/tidukerugisufomoken.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/56057181797.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/luwatokazibaxakuno.pdfIn PDF document text
    • http://markone-tools.com/upload/files/gapefovidasasolowapexi.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/vatifefinabunawawagosa.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/72451168286.pdfIn PDF document text
    • https://thietbigas.net/media/files/dusepisifesufobuba.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132d39f11585---80375516169.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/66105940613.pdfIn PDF document text
    • https://bloc-immo.com/images/tupusaxaro.pdfIn PDF document text
    • http://ore-processing.ru/d/files/69469351995.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/71042299616.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/telaredude.pdfIn PDF document text
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/dugipaxavajupezelilok.pdfIn PDF document text
    • 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_off0000d4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C0 17956 bytes
SHA-256: ddb62f7dd36cbb1340d65767a9bbae85d1d8a8e69081d24970a9ffebe2ac9abe
font_01_sfnt_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C18 11104 bytes
SHA-256: 5eb7b934e6a0d896d85d4ff848cd659e629a77d0dc426368b03f3379192f9bf6

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