Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93d09f8664a541a…

MALICIOUS

PDF

93.2 KB Created: 2021-09-02 16:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 75c200dfbbc0abe118e9a08c4dee5c04 SHA-1: 6c56da05f9832f5ce71bac689f89596369ff696a SHA-256: a93d09f8664a541abb8ff313974f4a8b059685281b54228bdd02e39921370401
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or manipulate search engine results. The presence of these links indicates an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://mujeresenmovimientoplus.com/userfiles/file/zawuri.pdf In PDF document text
    • http://taxicityplus.ru/userfiles/file/jepimazebejodixudorovadab.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/14726146581.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/ec39346abe85d183576c375b2f4058f2/2328196369.pdfIn PDF document text
    • http://garderoba.sk/images/_file/mizenatudi.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/78157422574.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/19001471590.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114671b77924---famelesuxaz.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/de13dbd4c74eee6c722b397b6fe8c3cf/71842421559.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/mupebu.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/joporogokezugepujixigifo.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/b811ei2l9hirp3ucqfp7ba4cg8/xanudugi.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/ribubidunanuwisur.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/simonopedagedumi.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210603204957689.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/561ae7c3ade10340128e8d712a8adde5/79506648616.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/93127782173.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160881a8ee02c0---72163638558.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/nh49bjmksnu4tpenufokdmil42/87630298839.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/82676232367.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/jefapulal.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/62207257099.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/abtprbclis2mkgnclh3dgs79q4/wuwotufepedibojizumu.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/muzobabol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=libri+patente+b+pdfPDF 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_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 10252 bytes
SHA-256: 458f344f1fe6ebed58ba8235c2bcb735fb28ece72f00731aaa849c7d5cdb4200
font_01_sfnt_off00011e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4F 18804 bytes
SHA-256: cf95adc762dae839fb48bc5963b0237edbfb964e2515a671b553ce72a33f3255
font_02_sfnt_off00014f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1