Malicious PDF — malware analysis report

Static analysis result for SHA-256 535039fbb74ff02e…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 15:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ecf1747dd37f8c40a28b6476e6bc349f SHA-1: 1cfce7c1dda725a40fe9fa8037901464e9ef52ab SHA-256: 535039fbb74ff02e596f0515c0391acc70dddb7c351ab9c30ab1133513e79efe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a lure, directing users to a link farm hosted on various websites, including compromised WordPress instances and disposable domains. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security scans. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://crewmak.ru/uplcv?utm_term=rfid+reader+rc522+pdf PDF link annotation
    • http://jgbt.us/pds/userfiles/files/62028274351.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/18c31bd4f23ce833591f28e72057e205/30812322079.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/71091318341.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086620897a85---97997589455.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/35957644414.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/vabupetetepuniwe.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/69015139530.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/615843a066462d392047052061483ea5/kinikidewabivaputexe.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/92493136207.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/96479731998.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/15106098204.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/13757036865.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e75b2ffd6581685988f9ad41cef941ce/gunum.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/zexojapepezikonupameg.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/52000483303.pdfIn PDF document text
    • http://innotack.com/userfiles/file/48195465841.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ni5539nfvrj9e3capsjs5ab18v/31581908172.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b438435de5---punijavupiwezuka.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a8a5035a83---jatarufejinemupikore.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/29072954490.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/60411599038.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/91520824015.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86a3b7ecfb---xujono.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/h5ssi2mbjbvr9letp90em3eo7t/togejonuzozisid.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/k4odqd9jehft8ptvdmlkrtteqf/99302320054.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_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 10376 bytes
SHA-256: d137bf49457a3601559892c8b024cf4e3db19f48994deff395a48f7c4a683dd9
font_01_sfnt_off0000ff01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 18616 bytes
SHA-256: d4b9aeef0be96ee1929b199045181e2e214251ef3702a8e445b39616d49261d1
font_02_sfnt_off00012ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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