Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8bbd140cc4e267…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 22:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c91dcb3c65cc6b8b74eb12aacb547d9d SHA-1: 992891b7126476287ed9dbf0a274a8a62db8a117 SHA-256: ad8bbd140cc4e26774cbacea25c76d71dea61853e99417f41dfac1b90614f73c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the presence of a link farm on potentially untrustworthy domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=haier+tv+repair+manuals PDF link annotation
    • https://puppometalli.eu/file/dukudaxebone.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/56718428861.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/rulekegabofidokewope.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/werinebidosizapujilezix.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/97096231603.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/77705997391.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/7591934294.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210621134135_fmnvev.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/sevisonufamulivaruto.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/d42d918233bd973a204f21f70400c4e7/74994549840.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/9d52a1581f75b9a861033a360608cc2f/rakajalamugam.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/golifowepokoxito.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/8369293154.pdfIn PDF document text
    • https://baongochoa.com/upload/file/64756337603.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/11763002339.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/juzibusinetixatapodevetox.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/54651201466.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb51f394d5---xifisavukedewoxanepexo.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/74718009367.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/en9nkkdu28e6k4hqpv47u0rddf/lonigegedutinisumedatut.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/6bjnfjsijeegrl3dphtphu56t1/21390041411.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/14012713119.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ce89dce3e---vosakatozozoverowuramuro.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/26293691371.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_off0000d91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91E 17372 bytes
SHA-256: 69cb249fcd979dc8bbfbb75d79eea2242b07f974bb6df0d9f762c38ecb6839cd
font_01_sfnt_off00010632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 10448 bytes
SHA-256: d0b37b79415d1d8608448646b866c8268de3df02333ccd6394d48f2e49527704
font_02_sfnt_off00011dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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