Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4458696b001b09…

MALICIOUS

PDF

84.2 KB Created: 2021-07-03 08:25:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 65655c8a156ab05dfa58521b005f8d73 SHA-1: 236149613f179e999cdea7e188c6bf5117d3493a SHA-256: 4f4458696b001b09b329212b0c19507adb7eac615c88ccb41a1f9c443c14715c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and links to compromised WordPress upload directories, suggesting it functions as a link farm to redirect users to malicious sites. The presence of these links and the overall detection profile strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crewmak.ru/uplcv?utm_term=norman+foster+reichstag+dome PDF link annotation
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a044376dd90ce0e640526f465eaf6ad/rubowegopujovisisibezipoz.pdfIn PDF document text
    • http://soupworld.de/upload/file/27986335894.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/3111267878.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870d7ec3bf9---xigukow.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5e125ac9d---zejotubu.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/pemarilizamufifom.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/bu5k8piaq775f2v0o0hhj705k7/befivogikovedofijepipapoj.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f66d450f8---wovimaxobomonebotelekeb.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/metid.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dedbf044def---58902338977.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/07b1510c71f61a2c8ddc26826d29480f/potid.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/wefobepugizakojifip.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902013b2dfb---mafusuvopol.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/puzunepinividemavurola.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4124962c058592f2d417c1a20ec49e6b/34789754428.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/013bd9eff6ea95bccd46ac1341ec2a78/firoramunodilamuvifutiru.pdfIn PDF document text
    • https://saam.vn/images/content/file/fifiwifosujofepezup.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/81599606725.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_off0000e573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 10852 bytes
SHA-256: 2eea3d438b147486e8e086df92c338bbce88a6c42db72c3ec5bd41963d85c7c7
font_01_sfnt_off0000fe21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE21 17032 bytes
SHA-256: 763d7b69c96a2040214ae48b079aa0d37d63890ea8baf109f073b62666776432
font_02_sfnt_off00012aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1