Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae0ccf2264dbfc7…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 03:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 715cd44b8b74dbeafba29dfc4a049681 SHA-1: 8a2eb3006684fa491cc64eb572f0f95612bcc973 SHA-256: 9ae0ccf2264dbfc72e0651ec1bc0bdc3a8bd6aae38af5491b68e45a9fdaa671b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to download further malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://folientastaturen.pl/_data/file/1641221597.pdf In PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/68040687105.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f4e0cb70c---55209464279.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/021e797e36d3604f4759c980b15d556e/tafezinabojoroxok.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/50898291566.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087316bd36a0---fusemipurazuniku.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079038c06040---xodusapomewetafiwubuj.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-14/images/files/42034405548.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/pifabuxixeriv.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/mowakun.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bacd72ad4a5---29023960692.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/favazalemikozesiz.pdfIn PDF document text
    • https://togeltop.net/contents//files/detafelisefuganikazejigab.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/vobejozekemomoxurirajuze.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pa2juqe3jdb67b5o6vmqshk2c7/robojovosiwimoniwuxenexof.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/wisupubepeniz.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16088336885cc6---fukedikoxi.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083a0cd7ed80---mefonubupemesetawef.pdfIn PDF document text
    • http://hifi-markt.net/kunden/kronhardt/ckfinder/userfiles/files/tefibasatenozugopeson.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/61453302602.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161132a007c0a1---21567926223.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/mijilinuvonagajezidutidu.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/rusabozosomuvo.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/zutumuzapupeta.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/riduferepaximof.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/3606622685.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/nozilodexakido.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/rulusetozomukogaboxizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=contaminacion+ambiental+en+la+ciudad+de+mexico+pdfPDF 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_off0000d5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 10888 bytes
SHA-256: 31bb3cbb7d9418c9d57e9f07bf86f5b7ca96cd3dc6766cb9b77bae79206daef8
font_02_sfnt_off000106bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 18732 bytes
SHA-256: 7ab412ddac4ee57f8014c0bf62ba8c3c3729fa41641583b75548cbcb3f5857a1

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