Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1805ef72f04e9d…

MALICIOUS

PDF

90.7 KB Created: 2021-07-21 08:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2ebc5eae42c976d7760131648834bf2e SHA-1: bb795ec35c6184f4d2dd0f14180cbd1173eeff86 SHA-256: 7b1805ef72f04e9d66b70473d48a1f7ffc293f64f17cdb343adfeebc3903ce32
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the nature of the heuristics indicate the file's primary purpose is to redirect users to potentially malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://voszveszprem.hu/_user/file/24243100850.pdf In PDF document text
    • http://highendschmiede.de/highendfiles/file/94570316584.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021612433289305.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/rakunapofetezitupuvonazox.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/d33lnu4nl7ci3d47sa8s4ct626/gorezofejaporik.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/290c8e221b165a39b4c830fda511261c/tijexanimafotuziv.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/86688385474.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/2880cb6c19949e9598dd61a8bb1c436f/38425145983.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/51941558827.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/15426604325.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/lidiparizoga.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/fugexesulafati.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b984e2875dc---15606120009.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/mgbkeddhhkd3rbtf8pnql50156/nupenolabekuxosoziv.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/nolivofijorosexugo.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/94910166268.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/2425201263.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/2a6dd892caab99d30140932e6f695928/90349050729.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93bf317e6c---78055520802.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/31999080850.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/zisomozomorabolugugefigoz.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/2ce58607141ab9b46f50e3c38c5fb251/36990463582.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/e8gpqtlgtijk2b1528hu4ftjo7/bonazatavogagupipim.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/451748f691f8a0cb3f9a58665631bd54/39611602051.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076de1dcdff9---vatisagowizugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=system+identification+lecture+notesPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e57acafea7894174cc83c75d098a5e3a/18028857782.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_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 10928 bytes
SHA-256: 94f0d8c546062281ae89c3366997ecb69d9b53f20f39480d98649cc2af913156
font_01_sfnt_off00011486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C98 18884 bytes
SHA-256: bbe28dcb2023048febabb732a348d906b7e9c7d3c8cfe5ced7ca15388dc41121

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