Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75f978aa7698d90…

MALICIOUS

PDF

101.1 KB Created: 2021-09-04 14:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6daca594d9e0533fd123a607cdc1003c SHA-1: ef739d602f0649c8a92ae103040bfcb0f6babf44 SHA-256: b75f978aa7698d90bcb869d8acdffff3d1c7de062d9af5940a377d4175e341c2
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings confirm the presence of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9732

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://pet-fashion.ro/mm/file/vuwodoxotigofiwupuvodalit.pdf In PDF document text
    • http://dentali.cz/files/files/43228055486.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/12314877709.pdfIn PDF document text
    • https://businesslife.com/content/files/41739602717.pdfIn PDF document text
    • http://minhanh.com/files/tananizipapugivupen.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4ffef0e4e---62361789464.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/lakadinu.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/93524068339.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160af6523cbec1---62109171611.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/danodus.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/97417453835.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/fusazepere.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/19939568989.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/fk6r3inalg4m0fnbdbb9ff45s7/74381445986.pdfIn PDF document text
    • http://slovoveri.org/userfiles/fefekozozamerox.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/17819084864.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b611149f5---labavalefomode.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62bcf3a97f---vetedofesoze.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/dexelaneduzas.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dadevigejewu.pdfIn PDF document text
    • http://elitacasa.it/images/file/63287047372.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0408ab641---fadavisamuvozuliraboz.pdfIn PDF document text
    • http://gerocuki.hu/user/file/folirovifavexujajufiwirit.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/nuvudoresowaz.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160730561246fa---fokexasilelu.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20218291945573259.pdfIn PDF document text
    • http://skomi.ru/img/files/file/24756308288.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16073efd45d4f3---13112051538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=oral+squamous+cell+carcinoma+treatment+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DF 11052 bytes
SHA-256: 93e4f9b12b52053ad5242b6117e2815da0433e997c5d28c5dad041e6492cb05f
font_01_sfnt_off00012d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D65 16516 bytes
SHA-256: 6496ccabee3ad7568ea1884032372c254594cbfe195217850f63f132e424edec
font_02_sfnt_off0001582b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1582B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001703c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1703C 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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