Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75818a32dce2a2f…

MALICIOUS

PDF

75.2 KB Created: 2021-09-08 21:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 696de7705c38e49713fed109e67d3770 SHA-1: c5acfe4b157ca7b4ce117cde2e13c9ec9657eea0 SHA-256: f75818a32dce2a2f4ce220ad765f60b2e15587db3f5b2c6927793c57400bec54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161387a7892515---vobozefuvi.pdf In PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161310387bf96b---denagunivuvolofakunazum.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/gubafikajorebaloka.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161325171cd1d9---zugiterunijetanukik.pdfIn PDF document text
    • http://klpa.net/userData/board/file/gifosepowovokilet.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/xujomegoginizet.pdfIn PDF document text
    • http://espicycooking.com/files/file///biwirajituzevakefuroke.pdfIn PDF document text
    • http://master-br.ru/img/file/38637866351.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/sebizenapobepusejigidokiz.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/wuxolu.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/depavuzaxij.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/49072408888.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/57180420660.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/xetolepadakepusedaxepep.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/xajipomifupore.pdfIn PDF document text
    • http://mamitobe.ru/files/file/20868339515.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/92466463750.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613194e19096b---bagewugusegulifex.pdfIn PDF document text
    • https://purefeeling8.com/data/file/6628027280.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/93862335143.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/zerafuvi.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/90690358664.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/bolokus.pdfIn PDF document text
    • http://reopen911.info/media/file/kagerafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+get+bully+for+free+on+androidPDF 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_off0000c04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04B 10792 bytes
SHA-256: a005a237ba909cc7d4aafc3846915ef03cbf76c0cd6182110b4b31166ca07fb5
font_01_sfnt_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 17696 bytes
SHA-256: c8e43dacb5ef7859eb77c32c3af59e86cb5bc7841ab999339775eec74e761de3
font_02_sfnt_off0001073b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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