Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b20a16f9d287491…

MALICIOUS

PDF

92.1 KB Created: 2021-06-26 02:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7e4ead4cab4dfcc1f684a43c73d4db78 SHA-1: ef750f223bcab24ad31bb7117accafc678763925 SHA-256: 6b20a16f9d287491fa8d0bceba3922e577ffaf4d20ac7f1427ecef3430d25462
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised websites, some of which are designed as link farms. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083703b0be64---kususiberurerew.pdf In PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fd9bc09f4---zowofekabalu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bjjnfp0ujhgofm6jar8rsn4vk2/fuzuguxogibikegolole.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/feniduw.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/66575271339.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/99185860980.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/fusobi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c45c9eae67---9645305827.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/fc10cd3c6a82eaa14e8b2c39f56432c6/dedatufoxijagisux.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0e963331cea35d8bf21ead58dd164954/99462809209.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/2k4op93sc4ico7ic3h95g9qm0v/xawefi.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/2549997478.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/luwuwoniporovekutidasaja.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/nasibaxesev.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/26579552718.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/729d64e961c3fae1c8e6780297f26585/559070486.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/14210299028.pdfIn PDF document text
    • http://waterreducer.cn/d/files/suwoxuwenenogenepe.pdfIn PDF document text
    • http://artistalexanderkanevskyroyalshakespeareglobetheatrelondon.com/clientMedia/file/gixorefelaname.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/zeperorinedup.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/92478571821.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/dph0sjfnm3lvhacmmftmv6lkfn/68119266423.pdfIn PDF document text
    • https://irantruck.ir/data/file/18842610545.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16092e82da7f03---68799301011.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/wigovofur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=copy+text+from+encrypted+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_off000102ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B04 10560 bytes
SHA-256: ab7aaeaa878e301242e0702c3dc119831e20dc3c67ca572006d74e4966e31a7c
font_02_sfnt_off0001331f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331F 17544 bytes
SHA-256: 1b6fbf4555c55e40211e50e6c1cc864e8c633adff70804aff4f352491fe17fa4

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