Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b1354db76b302ba…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 12:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a516a4228429ead00dd1b85e3e97638 SHA-1: 875e4c75cb8aea0cfecde870d5df3497063a00f4 SHA-256: 3b1354db76b302baf73685577c4afc713697f7c3478bea11b52cbf601b4f2ee0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_CLOUD_DOC_LURE' heuristic indicates the document impersonates a cloud file-sharing service, a common social engineering tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://pixomot.ru/uplcv?utm_term=apk+box+android PDF link annotation
    • http://deleeuwputten.nl/site/data/ws/files/lukolovigirawig.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139423b50ecb---fofokixo.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210912055700.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/65564652260.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/8571966928.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/19969852816.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/lolubirelazixowotimewob.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/80904630883.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/biwibumasojuwiv.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/53943280625.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/rudetipiwixa.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/63302954662.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/33353473594.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/77690011450.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/cf0e3dd814bdd78d4b13d0a3b4f371b4/39555184303.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/41319584021.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/jowovuzexitelowom.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/guvexexenulep.pdfIn PDF document text
    • http://philipsphotographystudio.com/nafipuvunowafidowonuwuxup.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137e03b21b5f---salasez.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/roledebefebejazabila.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/wawosizisidelofutamigenew.pdfIn PDF document text
    • http://retailcop.ca/files/13235003293.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_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 10256 bytes
SHA-256: e288dff07b0c8617e0b35eca22edc1fd26d07f662737cada295c824519db02cf
font_01_sfnt_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 18944 bytes
SHA-256: c8a9d4a14f8281c0be1353590736caf88d3d1dff47323171c98e7ae73490b0a0
font_02_sfnt_off0001211f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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