Malicious PDF — malware analysis report

Static analysis result for SHA-256 669301a02a6bba42…

MALICIOUS

PDF

87.3 KB Created: 2021-07-08 01:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d29c99c4cbada6e778ea361d42f8dbcd SHA-1: 9cf0697b13effdf994287c75e18f1ee6a33c1788 SHA-256: 669301a02a6bba42a972a65cdf46f3bf150d3a82a7909baa5ef401250bab55b2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The primary attack pattern observed is the distribution of malicious links, likely intended to lead users to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://shiraz.sk/ckfinder/userfiles/files/29316639569.pdf In PDF document text
    • http://cropscipublisher.com/files/upfiles/file/32045678784.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd8b1417f4---53351332720.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/2059022948.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/52011170963.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6cdcc0489---sasamiwikegajofexizitanor.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/16951881966.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/xesazawirotudimokepis.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/87vmc3kubd7nndl3m6vgudqpo0/papeleg.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a826a882c14---murerawo.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/jasifijaperuzebagev.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/212c508669ce8ddf407bd2cd2ba40be9/vibopogikokuzupamisir.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/121b4ec476fb2a29a5f8351044400fbe/loxodixafavivuziti.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/rvbbqha8ggbvanp8b2kf6cv3be/77441956779.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160c79006dd76d---59820917201.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a566d9961---62947252711.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607acd9719d5d---10109836034.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fdf6af3564b56dd4ae42e2b43785c2cd/13108135152.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5a293b5d30---kepupepoxidusiva.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4072454e47---27533704937.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/883dc1821e153ee569fc4e863cb1d495/sogekolapexufefebilizebu.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/xizukesojubuz.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa28b78462a---96484711019.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/536ee30c6a4ddc7b9ea6b4439237ee2a/risokomotevu.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/91584267481.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e87fc52903---72877172979.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=4th+grade+questions+and+answersPDF 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_off0000eddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 18300 bytes
SHA-256: 24cbff5833430a82e339ebe88914a247a3f00124c1eabd54aed5c0042541ca61
font_02_sfnt_off000135da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DA 10792 bytes
SHA-256: 8d2fa8d4978b5b4d5738f2761928977bf4a08f5b616b15464ae0632d41577aac