Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a2a8e103645c3a…

MALICIOUS

PDF

73.5 KB Created: 2021-09-25 16:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3bcb08015580db02ad86d38b65337bfe SHA-1: f28630b9cab76284e0b1c67d5aba5b442dbe0fb9 SHA-256: f2a2a8e103645c3ac6d44ddf04f20779f6425045c6766806d58a243d51a8aa8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to drive traffic to external sites, likely for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://queure.ru/uplcv?utm_term=avg+vpn+mod+apk PDF link annotation
    • http://cartopack.be/Images/file/907747760.pdfIn PDF document text
    • http://builderall.info/userfiles/file/zezorozo.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5d6352294---bidafudapoxeti.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/goterisivaped.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/zurusibexamogan.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614682cf40749---barukurazaxapaxovuletu.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/wumujozer.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/96368228116.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/67473687331.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/tukudelutawibozuvumo.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/48731244567.pdfIn PDF document text
    • https://manenshop.com/upload/files/12915286497.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/97044184288.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/4071285558.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/mupokofaxejozepaluda.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/26754226256.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/wixagurisekon.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/tajaxuwofoza.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/fumelitobabu.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/fipuxomipovanolukukoxome.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/15379008085.pdfIn PDF document text
    • https://filetorme.com/upload/files/64497022086.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b31b353e66---1093913999.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/86050249499.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/giwubokeseselekizida.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_off0000b85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB85B 18948 bytes
SHA-256: 2754c8201805311366f3bf1c7238baf7905fec43a94e6cb518f84b3d1f0cee8f
font_01_sfnt_off0000e93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 10240 bytes
SHA-256: d78c0cca48a75c186dbf00b68fd9b110207393193466bde39fc6d3c28599cd34

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