Malicious PDF — malware analysis report

Static analysis result for SHA-256 031a1f415801c3af…

MALICIOUS

PDF

131.0 KB Created: 2021-06-21 00:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9c7a1613ef784ecca5ad7613ce8eb565 SHA-1: 0e8a339dea4ba77a69cdb54d5546aaf37a58c311 SHA-256: 031a1f415801c3afcec480dee12a95bdb8684c4d0916f85d38c66da95d74db34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/79d9a5f6a043712a958c47d76629e4e3/10154888762.pdf In PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/56rfpu96ir3q7q4sm7v3elc70o/venesubaladux.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/zikuketudavuxot.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/2c8e24mtkn097l155u9ecj14j6/zugirosowefewubixa.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc9f842853---wetip.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160737db8b4b2c---6070865577.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/tiragewufepulezatopu.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607c02d6b7390---78527445167.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/36017677856.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/82983890623.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/73977288059.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/5pp97ttiqd86udl01h3uneiipq/53314755983.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ne9ohqe9pkkcqpb99qpsb6v8l3/49997109039.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/8gqh6dc0je1p2cnf1vhj5iutfo/84628476426.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/45a358fbe7f2d6161865493da3e843a0/93516977219.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/5e15ee0fa14f7c0e0d518ceba5a20be3/lewekegasavemibekivugozi.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079acbd60a5e---wufutesumokebikigeva.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tulsidas+hanuman+chalisa+telugu+mp3+free+downloadPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001c5ae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C5AE 19300 bytes
SHA-256: 1477814d904388272f21de297b53ec778a90921150853b703a9bf1d996c0e3e3
font_00_sfnt_off00017df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DF6 5772 bytes
SHA-256: 6efd8b414a4c45bfc3035ef37b9e902a28c9b02a368b9e71aa3189471f494cdb
font_01_sfnt_off00019180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19180 3772 bytes
SHA-256: b850e935aaf604f3e1824861b6c46746957ce6d0e1401f4bf16d070b42224529
font_02_sfnt_off00019d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D24 13148 bytes
SHA-256: b575a108172bdd67f6b2488a8b195b916ddff93f12bc64ea3c9f969270eb0171

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