Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d97b4b1a386054…

MALICIOUS

PDF

124.0 KB Created: 2021-06-26 07:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5dd7155eea978268466ff5c889c6d4c SHA-1: 88209545a883d6c1f94161861d5f50db623caf02 SHA-256: 28d97b4b1a38605472ad8975b7f1a30852608d7ea7aaea32da23cfd0a310eef0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links are likely intended to lure users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://buddhavehicle.com/userfiles/file/58072826877.pdf
    • https://advance-pack.com/editor_upload/file/63354335187.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071b1bdbc478---xibupi.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/pjkvkmju6jffi2p21hnsmd3snm/61622313496.pdf
    • http://linpus.com/app/webroot/userfiles/files/70081112304.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/25631266468.pdf
    • http://computergramm.com/userfiles/file/36453543272.pdf
    • http://akvatoria.by/UserFiles/files/96298029395.pdf
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/konirix.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16089320e3c221---99376898513.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b5f2b973f4446004c194d82df93d7cf8/nigilunodibutejadesi.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60c0eebc8d---ladejabubafedetojanutebok.pdf
    • http://sity-luxe.ru/userfiles/file/mofoj.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16097693992d45---gipimegepeguxujapi.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dd8acf7c1---4399414765.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/7d58baa826b213ae1c73b79600d1152d/bojebigurefi.pdf
    • http://trans-serwis.com/userfiles/file/fejoxivosi.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/s652a9746gujaotgb2781rfppo/sitojelonajabodakimigojom.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/ktdqhmminfm15garbkbpr672g6/zubaxekukekugowibilufigi.pdf
    • http://www.findvoters.com/userfiles/file/rasazajer.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/99537f7433f44399d2a4ace93ce748ff/61953287080.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mary+russell+books+reading+order
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018117.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18117 16792 bytes
font_01_sfnt_off0001992e.bin
5130b78e7db3cc1338977be5dd42f02b74216d2b1052b4d36cd3512761352687
pdf-font-stream PDF embedded font (sfnt) at offset 0x1992E 10764 bytes
font_02_sfnt_off0001b1cd.bin
42c193560533dbfe59930903ac698e0823e91b533b35f07ded97eb97d55ee125
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1CD 18172 bytes