Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5b063cca96bafd…

MALICIOUS

PDF

77.1 KB Created: 2021-07-30 02:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 25d87afee469d5ab750566de03129ea5 SHA-1: b9d9e4070e8e418c9f3bb24d652677c4cd93505f SHA-256: af5b063cca96bafd75b5d36e5946b6b9d4c0eaa9cea0da4dbd0ce1e6a9458f58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The primary function appears to be redirecting users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rencontres-icare.org/userfiles/file/24621858142.pdf In PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/7c45390a2b4ecc3d29ce945143348a1f/50308154752.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/bezofilaf.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/53108000215.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e791572e6---63578642143.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/ec559eb5780a2cbac64476f26142f9cd/xafabanukalitewupoxuf.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c76aece273---kadud.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39c7a15852---tagebewod.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/60860003146.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/lubigejisolex.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/43363204503.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/26473196170.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/reloviwik.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16099bca208613---43621210055.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/85655221995.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/rejuwugejotolavalikiz.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/7584418588.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/50709220757.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/pibetabedu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803d0696a7a---kikomid.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/gonilusabiru.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/10483345759.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ad11bc005b3---terefuxolut.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/vmg85ee1t81sg7obdd9aq0ajb0/18771040429.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/e68r7j800dq4i7gihngt71lp0u/wagipivezidopagovanuzivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=el+esclavo+francisco+j+angel+pdf+descargarPDF 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_off0000c6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A3 17744 bytes
SHA-256: 0ab998a41e8f6d996cc2b88a0ee3dc73568d789074b02aa3e1d735188692c472
font_01_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 10876 bytes
SHA-256: 5e647521164ed376a5167c39f65ab89b4217d0c537c43b5e491a12fc1f9746a5

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