Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0243824cca7edcd…

MALICIOUS

PDF

120.8 KB Created: 2021-06-23 12:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0207ffa8b57ff83fae4206594b98c8cd SHA-1: 27b4094f472dadcd96f84c8bbc9497ad047cecc9 SHA-256: b0243824cca7edcde59603b0a3ca04e9299b6b820ccd91346189c09321ff563b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566 Phishing

The PDF document exhibits characteristics of an advance-fee scam, containing language related to lotteries, prizes, and courier delivery requirements. It leverages numerous URLs, many hosted on compromised WordPress sites, to host the malicious PDF or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://nomylo.ru/uplcv?utm_term=dragon+ball+super+broly+dubbed
    • http://artside.org/data/temp/file/zevowifodubukosazumaxopem.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/fd37dbfd085365f27462f76ddaf4d940/7476629973.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3ed7a7e99---musufoporefevaxezusalomo.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7cf29e278---tatotolipezamujokofudogaj.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/5658b11d960ef854e613490ca797083d/48118189041.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/72dbbdc1bb69f1068dc61385f1917459/porezikijetufozakuvuv.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/9a0654201505ce604ed8a74bdb04d944/85430103451.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/2v0atp1sd69i48jbe79fcajm73/84111748585.pdf
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/rekonul.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/17tt3q4b3s4g14jgps4dpntmai/rimokovozisuxopunid.pdf
    • http://barudan.hk/UploadFile/file/20210611045516018.pdf
    • http://buddhavehicle.com/userfiles/file/32817148902.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/4189a9bb407583491e39a43bad812c71/xuvimevipegugesavanamagol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015168.bin
39b0183067e1e56427934cbd3be7e9fb3e510b5170dded166fb568fab43db4e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x15168 14596 bytes
font_01_sfnt_off00018077.bin
ce718be8f0368f233d3b05e6b3358f61af03fc89055ccabe32794d8ea65e7127
pdf-font-stream PDF embedded font (sfnt) at offset 0x18077 5124 bytes
font_02_sfnt_off000191db.bin
a1c68180eae955d710b1f59d89b7b5bb1f22246194deffa7b9c3298859733f9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x191DB 2140 bytes
font_03_sfnt_off00019bb3.bin
6708e2badb9cd7dbbcf05e7e637b98b172d2f394c74cd47be9b53a77db6335be
pdf-font-stream PDF embedded font (sfnt) at offset 0x19BB3 13568 bytes
font_04_sfnt_off0001c704.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C704 4324 bytes