Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd83367019ab3c5…

MALICIOUS

PDF

74.4 KB Created: 2021-09-18 06:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6892141126eb2588d383b224c496642 SHA-1: 0da4c28a10d2aaa9d9c5a87e70e54a8d28708570 SHA-256: ddd83367019ab3c53322972d2fcad2597715dc6a030d66b289cb4e0e04074bf9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download a second-stage payload. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://straub-online.ch/userfiles/files/59877954075.pdf In PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff76596396---42792846815.pdfIn PDF document text
    • http://turnyras.lt/Files/file/susinidavaposorava.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05507807e---49461307103.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109071329112205.pdfIn PDF document text
    • http://gestioniarmatoriali.it/57860192757.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/tefelitekovoxedujonofivuw.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/zanofaw.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/47193247070.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/padamenifuzegob.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/numumelesinujeduko.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/32746685293.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///bilukelopejizesajazul.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/24109968459.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/zukojaw.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/13041736329.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f187eb7f6a---64871336517.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/xonep.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/18330294101.pdfIn PDF document text
    • https://iwistw.com/upload/files/namaboles.pdfIn PDF document text
    • http://splogservice.ru/content/files/wazasosezavuj.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/najazozigebebozuxopafovot.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/89694848306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mi+tv+connect+mobilePDF 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_off0000c2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C6 10160 bytes
SHA-256: 424c11da2e8b6164184265b6174a0ac15221ad94916e98a68145b5ae1e512fa7
font_01_sfnt_off0000d980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD980 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 16460 bytes
SHA-256: fa685b445ec33f0446e33589a033b5fe3b54483b6602793394dca4edab6c7762

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