Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d2cfef706033897…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 11:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4dea46e945d835395539bf862284aadc SHA-1: 699e9431f484b1d8bd0ef50720008d98e18217f8 SHA-256: 0d2cfef706033897be0055883fe51a6553532bc8d049d2059e147e9fe3ec651a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically highlights the use of compromised WordPress uploads for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=comparing+slopes+and+intercepts PDF link annotation
    • https://alrashed-alsaleh.com/userfiles/files/ditomomibuwusovofij.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/98857533895.pdfIn PDF document text
    • https://motoralbini.it/files/file/nesuguzupulebabi.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/ledepakiz.pdfIn PDF document text
    • https://campermagazine.tv/public/file/sufositoxot.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/25963503145.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724f12a1e35---jagalewepaforidifoto.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/128a900343aa28c1fc3609ac61e0219a/petukitenabujekavifiseg.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/38472900013.pdfIn PDF document text
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/xunutojigoramuk.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/62523683051.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/telewidejujita.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079304655586---5458484152.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/69701006936.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607465ab507e4---gepurafimoverebotewijoxa.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/41f83f01104e890feb7b1c0a0dc5798b/27680564744.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/niruz.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/mopodoluwezijiro.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/22730051933.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/88120553147.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/71946efabb79c870f2109bc130cd98d9/fubukirizirodiletawaxu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6473caede---voxuleweligepedomote.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/6446699173.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/16990991.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_off0000e896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE896 10888 bytes
SHA-256: 2c2f6b6a751fa32df03e5e3b14d187a42324748d1a17fb4466f244fe339858d0
font_01_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 18320 bytes
SHA-256: 28c9bdeadda4aaaf6e097db21b69b87142fc7ecbe1e2b3ddd04d64c5e4c2c45b
font_02_sfnt_off0001324d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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