Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd54ca3438db6a2…

MALICIOUS

PDF

86.7 KB Created: 2021-09-02 02:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3024c5ab9d0cc80983c670145c74a2a3 SHA-1: ba046b22603b43a4324f1ddc6cf4b5c4a54f1e7f SHA-256: ffd54ca3438db6a212809fcd98700ff2defba64e161dd1685cfd6eb7f2cf50e2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains a link farm pointing to various compromised websites and disposable hosting, likely designed to lure users into clicking through to malicious content. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://immo-cjeanpaul.lu/userfiles/files/xeradoberufumuv.pdf In PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a2538d0bae19484e09c8903dfc54c559/subiroxovoneteged.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/3c85ed883da49fe447afe6565f0c14ab/bamepojowovit.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/zugoxomamiwivavepejexasow.pdfIn PDF document text
    • http://furniture83.com/upload/files/zubamobesigiwomawego.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161095af5b5400---48187881067.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/6ba9ec07f7f06d0a2dd4e0f069155cb8/71966893724.pdfIn PDF document text
    • http://teraval.cz/res/file/zibafarodopizogonamegakon.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b476a27bff---52060083829.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/ganidoxazipuboful.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/podufariwukawujesevuzazo.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d1a1c07e9---24960606336.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d96ef2e0e1---ninoxozetozaxi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c244645bb7---zifojikepakoxane.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a413ebd9d2926ef3156a7ed997024c5e/5298725192.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/zekuwaba.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/40618ee17a652797023db470d5397ac9/kebuvu.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/iq2g5uohjuv5hdpoefre5po2o5/loxagimogeselifeja.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160755a82074c9---binejewopixaxaripon.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/57feba7f447b0f5ad17859faa3f6051f/46028893853.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/69312270785.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/babimenelibixoxukabu.pdfIn PDF document text
    • http://e-menu.hu/editor_up/22281221478.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8b6eaf04c---rakosujotaxew.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/359b34c3c4fc49f6e30a969c5d1a39f9/88136822750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+angel+experiment+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_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 10720 bytes
SHA-256: 82204b5a26fc6078a43547c40ae92e1932a1f4fb87c3457431d44c782ec7f36f
font_02_sfnt_off00011ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFC 17092 bytes
SHA-256: 3a845d0cf8bb5887352a8266478a8e19720e4e02bc7fe9c1fc5adccc7350c037