Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81eb813e5faea25…

MALICIOUS

PDF

104.3 KB Created: 2021-09-05 03:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9223734e8943c868c74a50fdb7aacd73 SHA-1: 8a24c1ac16af2f2e5e543a2a1ed0c676d85dbbaf SHA-256: d81eb813e5faea25df73f61aab6c5c1e5be4582424f1e484fa568b832aec8f9e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious or compromised sites, potentially as a first stage for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • 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://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a11ac253a7---wunofonor.pdf In PDF document text
    • http://zulaikhatextile.com/userfiles/files/87414862342.pdfIn PDF document text
    • http://tercovci.cz/files/file/wenowajovu.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/tabosigas.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075619b80724---71040017820.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/16368500850.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/dumipakatinala.pdfIn PDF document text
    • https://nls.vn/upload/files/memiwuvutamijepod.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e2788a26d11f8051a093285b4b0fc444/javebiravajibiwi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a92ad13861f---48224245960.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/vafodepujeki.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/3iii88iv7427r15qkgcas33t4b/bidipavebep.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5575e382a9---loletozad.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a888830a684---nasidubozemawepitukefu.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/0879df2882d9088def0b198f74d3cb74/71118561556.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/7569813729.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c98784424a8cb60f4748ae90df4967c1/tupemojow.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16088837781a22---88004575344.pdfIn PDF document text
    • http://smithandfriendsfamilyreunion.com/clients/d/d0/d05d9bb0b75700e7199fc64e52c62161/File/32786999345.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/baputubetamumefopen.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/8559962926.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0b4152e9e---32177423613.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072c7ab46152---liroziwazizo.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/23150365820.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/34cd843a6e079c3c355a2639bf58a31e/90112921210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=arusha+declaration+in+tanzania+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/e94d4b4759c5dc399c47c151d1938fad/volafajixoxu.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_off00013018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13018 10856 bytes
SHA-256: 1960d2b618fb087bb570731c1f6c3f1dcc088c56af4cf821a93521500516ab40
font_01_sfnt_off00014928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14928 19140 bytes
SHA-256: dab3de46d891795686cc6635feccd75f8818f72dbe8167ad1bbbd847678a60b6
font_02_sfnt_off00017af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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