Malicious PDF — malware analysis report

Static analysis result for SHA-256 b26fd31d70b5368e…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 15:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e125cdc0fe24f42351571d4c505a0a4 SHA-1: 3cc72a62cf83f9c61c69c6a1e83c0cb9920bb70f SHA-256: b26fd31d70b5368e1902e564fb72323dc867c37ae1d2938097d656c0c985def4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. The PDF structure and embedded links suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.scea.edu.mn/ckfinder/userfiles/files/14562519349.pdf In PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/dipudixetibizuxepiruvuvor.pdfIn PDF document text
    • http://seamacros.com/upload/file/86295469085.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/66ddb0226c8f0b9c22137f02c01977e3/pisoxivaguwevizogo.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/zulegevobezipedaxalujima.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/wabogazabubogoso.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/75dd1f72e3dc9a63593644ca039eb9bc/kikob.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/pamezolulaberegefa.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/5675530120.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/jng225cfifsumj58ggvbiej92h/59691180527.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfed3354c0---xutapasuleginute.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/51f5b01c823929a9786956c5cae107b0/fasovotutuderijesovif.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/tifudugozab.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/eb122854d5eede5683d00cda3442f25c/27804587741.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/fbde7b0f72141b5d19f36c32cec772f1/zumimupofupewapokuxini.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/11707466806.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fa21106d680997a513ced465a7bb8f1d/31901853421.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1628334378_ece53a828f.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160866912a5b43---98496098893.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/didugep.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/12099407456.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/1698530051.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607435d84c308---vulivexalutudulakexox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=materi+genetika+mikroba+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_off0000d5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 16812 bytes
SHA-256: 0d6157e8ed0ed9700b8d2e4c6457674071ac272a0a89d02433a90e98d1727f40
font_02_sfnt_off00011930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11930 10852 bytes
SHA-256: d3926d92e390c414c49ac7b31c0e87967f8d2fa7c094fbcca380732912d86ec3

Open this report in the interactive analyzer, or submit your own file for analysis.