Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71f3db39f762874…

MALICIOUS

PDF

81.5 KB Created: 2021-07-21 12:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e7f73b9413b99be4cac775e49d30566 SHA-1: 8e16a1952ec37e37340ed912088c0b63cfe984a8 SHA-256: f71f3db39f762874e7f40d4ece268efa0048fc7031cda60a40442f714779790c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5tkvb4ttmq05u36k41ainec2f0/xugewaripowo.pdf In PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/28337601393.pdfIn PDF document text
    • http://ipublicity.cz/data/file/80075876814.pdfIn PDF document text
    • http://alakharia.com/public_html/userfiles/file/43016667268.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/bidaresodejafoje.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b06967d4---35462096482.pdfIn PDF document text
    • https://majubesar.info/contents//files/sujapenoxi.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/zokadaka.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/dowawadekizaxunote.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ss33g2acdb79r2dfh5rl68h17d/tapel.pdfIn PDF document text
    • https://stvorki.ru/files/file/84786210905.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/scldkentu4fdlgf95qp5v00sgd/gufaxidagilofavowakarap.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608776c325b01---dunekubagolezetimup.pdfIn PDF document text
    • http://mega.kz/media/upload/files/witorakudiwires.pdfIn PDF document text
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/gizazuluwoxopiw.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/boqpqcq4g7okqcoj9u8v5ro1mo/15844871258.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089863f76fd2---vabovamufumekozawiru.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/f7a72c4f46e251773e240366f46efe7b/mofezodobawu.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/wurolimewasiwetodasageg.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bffaaa8cb---fipiwusopunuromosup.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/19995638890.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/279d1ef2b0f8bb5b75b3e7c74119246f/kidojerapovudogad.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e7bca6d23---tejusiwa.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d7b7c2762---dusofatoxeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+unfollow+more+than+one+person+on+instagramPDF link annotation
    • 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_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 16344 bytes
SHA-256: 75de594858ffe0388591f8c1455b376af46b12f074592956a5d1732c1e6cb014
font_01_sfnt_off00010d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D95 10980 bytes
SHA-256: dfb5e6847e21f45195806660b3a84b9eef74397dec640d86c2db975c390b4197
font_02_sfnt_off000126e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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