Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5cff0160c9bb2dd…

MALICIOUS

PDF

86.8 KB Created: 2021-09-07 19:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cd6653a655c047a4a4b0aaaa6627c59f SHA-1: 17a5611a8719d586c867941ce2b00d15f7c98434 SHA-256: f5cff0160c9bb2ddd5df0bbce078da9d493b73d6a60152744fa321697462a7ca
156 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm pointing to other PDF files hosted on compromised WordPress sites. The ML classifier and ClamAV both flagged this file as malicious, with ClamAV identifying it as a phishing trojan. The presence of multiple links to potentially malicious content suggests an attempt to lure users into downloading further malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d39701508ef---45540669488.pdf In PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099d76296bc9---kazowasazopelenom.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/64716620519.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/xurotamagavo.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/33022774890.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/nabodofoledu.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/8310414123.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/87956962171.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/82732835850.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b50a973939---nomaxupatilixadejabed.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16107c62aee2d7---83056228668.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081523f54d1c---bopogifeb.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/69196926761.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/pafusigukivejud.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6320a88bf---96830883754.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/70487076460dd9ccf90940.pdfIn PDF document text
    • http://sun-tes.ru/files/file/45120579495.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210802125314.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/79802410224.pdfIn PDF document text
    • https://avenue102.com/uploads/file/5002921478.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/478aacf9d9efd907171087dfaffbf028/lawatumigadovaras.pdfIn PDF document text
    • http://zuche0551.com/upload/file/zofabivoz.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/xejimakepejititagomud.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/tasaveparonagikasuxomud.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc4cf9bc127---nisakuvomelesobav.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/19750912178.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/tinuzuwudulugajalowis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sale+letter+format+for+bike+in+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_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 17780 bytes
SHA-256: 11007b7facbbd29a422ad4af345b9e70e9760b308ee8b1f6af622ff8c2e74ca4
font_01_sfnt_off00011c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001347d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347D 10796 bytes
SHA-256: 5762cc31e1e49dd09deb20fa7c8e908ae4e652b70eee3686e8ecaaf21c1e0b60