Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb59f07e54fd1875…

MALICIOUS

PDF

79.8 KB Created: 2021-09-08 13:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 88710380364f64fcf5ae40b81fe9834b SHA-1: ddd3b16f8271beb1a867ed312296df60893ecd9d SHA-256: eb59f07e54fd1875d965a6a6940a1854f9e7309e79f159ecc0770b04d737bd81
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing or malware distribution campaign, indicated by numerous external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards the document acting as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=comportamento+suicida+botega+pdf PDF link annotation
    • http://nguyenphat.com/public/default/ckeditor/files/koturarodipekawedavike.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/xadifut.pdfIn PDF document text
    • http://greenglobepms.com/uploads/nojubaxidirujegi.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210908052812.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/55926197657.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/67867933781.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322763964cb---zirep.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/fipewezuminifetilawami.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/71990102009.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/9bgin620tlt21pt2t6g7ime6tl/80545416055.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/divetepefajinamerudorugi.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/seviwi.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210906164818.pdfIn PDF document text
    • http://xmst.com.vn/app/webroot/uploads/files/17841821413.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/mojodimovatewutuj.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/3777502ae18795713e7180f1802298ae/84649378722.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/25215638049.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/jazubekigowom.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/togisoz.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/79314094007.pdfIn PDF document text
    • http://klhl.com/userfiles/file/lirawikulor.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_off0000ca6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 11188 bytes
SHA-256: 60410134cc9460a2a9600a74767a4650fb2d1321c0ce08684897609cfca0471d
font_02_sfnt_off0000fc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 19676 bytes
SHA-256: 25da2b2800e167d9d73d27959686cd2b404d3e227880171f08db26b7240608ea

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