Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9759a67ba1accc…

MALICIOUS

PDF

92.2 KB Created: 2021-07-22 11:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 132cde60042925501da4c50db3f9a473 SHA-1: 36065d164c058b27070a61cd4328a3165c834806 SHA-256: 6f9759a67ba1accc4a7d867cf2e99520e6691a243bad3753c7ab5866f070c3f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves tricking users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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 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 https://wineart.online/userfiles/file/dabugifomaro.pdf In PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acb7da59c8---rerasedajitefonukom.pdfIn PDF document text
    • http://hotstamping.pl/files/file/lafuruwabirawixasozenefij.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/guzopuzizupo.pdfIn PDF document text
    • http://erictex.com/ufiles/files/wovukaxuxowenibawuvemuluf.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/f086638252f2977b87b4e57570027232/sideraxuwivuriwusudur.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/s0dp43p181p4o5gvlgsr9vpu3e/nolonulavekalogifagivuri.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16087fb9668877---63366412758.pdfIn PDF document text
    • https://egf.tw/test2/images/file/rimutumitojuzotafamidifa.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/m97l2g52lmt4kto1f468559vg1/debokisojizolifugituvi.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/91385093913.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/53694505469.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/53181bd7123ab9313a515dabc526bd60/73233864772.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/sasik.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/30577294623.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/eo99hnbbub920vaa6b5qgkojma/91955326819.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/488d978c909bfc08c0d42851a220f1c1/92492372726.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996ae1aa0e3---24101114001.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/57106824533.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abab32290fe---96348130284.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021516628342148.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/gazaluketuvorapini.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/45768312546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sda+old+question+papersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 17168 bytes
SHA-256: 7939686d42919d0f051b3d313ce7209cd096bc9606f304fa8d213ee9a28a3479
font_01_sfnt_off00011c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001348f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1348F 10708 bytes
SHA-256: 8d4831f8cecdccc16b8b45fe8ece45205dacf3a7b2bc34ddc5cb1867308fe9e2
font_03_sfnt_off00014cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF4 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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