Malicious PDF — malware analysis report

Static analysis result for SHA-256 76fdd9af6ac28945…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 08:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9115e26541241a86ff48737add8449a5 SHA-1: 16011f2ec0d2a156b0634f00752214f0510781eb SHA-256: 76fdd9af6ac28945ff43df999c24ea65e3d4f0ae21a8a16adc236ea499ef3a29
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for further malicious payloads. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbbd5eea92---30181259702.pdf In PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/afbf15f9e4eb6e70421b29cb7822d045/samesefusuwujatememis.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/fdc5694d22b419f61c344693c17d55cf/20317511888.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/29321922870.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/96b7426c14085823300d69ab8ae27ca3/migawulobuladotidew.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8f461b8b87872930a0475ebf35f160c1/32733854172.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/69634041691.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/8784602481.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0aa9a14d6---38240357031.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a38baa75a4f39f7dd2ef222817c8bc82/dokudejubopezarasik.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/sosadogokaronukub.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/zabijep.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/kufowaxikanebitewoxidipuj.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab59e7f29aa---faxukeralovon.pdfIn PDF document text
    • http://ud2-140.com/files/65518498944.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4bb73a57e41db2f2118f8c65acb239ba/87391061729.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/baf14d9d03c84fdde3796836e131df8e/gamofegelomami.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/6vct9ahl1mor9pmkmhafqpiso7/dozukufivevugufikipedi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa3cc8582fb---tisizawuku.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/80692022150.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/tafukewif.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/fanow.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f47dae72a7---nuzidebugovefuluwubeti.pdfIn PDF document text
    • https://ultralloy.net/upload/files/funumajopizujogej.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/kajutozaduxaf.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/26285066595.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb12d2a861---perunolixovixon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=english+spanish+verbs+list+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/0d51cfd67a58b54fc10c8d5ffa62d393/95058432121.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_off0000df9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9D 16924 bytes
SHA-256: de104007dd38ca7887ff330fa9079ac6beb82cf11db0a4b06066d46a4fa34e3f
font_01_sfnt_off00010b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12375 10848 bytes
SHA-256: c8c4a4ef75610dba3aaf5b50a3654df02b649516d6c24c323ced6593ef9a3e69

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