Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b54abb1d6beb9e4…

MALICIOUS

PDF

77.6 KB Created: 2021-09-03 01:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8141048d696925294c48975c6f48162d SHA-1: bf83aada24900d2fd6ed2bf0491fc1b5279eb14b SHA-256: 0b54abb1d6beb9e43ae69f05288e22cf62874440b4ee177cd1643442aa5b22af
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics further supports the attack pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ba0c6qahe56p8sga2pqf6mgqfn/49143528225.pdf In PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b474ace38a42b5af3bce9871786d5882/56821331627.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079521b38568---10919086970.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/90846007176.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/silelusajudujerifubesok.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/1507b5727fddf6db3c94136fd12bcf4d/74739298760.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/19298834363.pdfIn PDF document text
    • https://mauspro.net/upload/files/96907983990.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cdab7625a45---dupiwusokixomidimugo.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072f33ba3df1---gusibof.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/38294030969.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/2e46cd0e19c0fa42cc6cdeb057dd6955/jasinudutofeba.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16117727740f86---58446068547.pdfIn PDF document text
    • http://sieuthibds.net/images/files/30502170787.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/d89a7f10821e60eb7c84cdaa60637619/votajeturamaduruxazonanaf.pdfIn PDF document text
    • http://imaginove.eu/data/Files/bibasokasovumu.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/zejuliduno.pdfIn PDF document text
    • http://polletnv.be/uploads/files/24515524928.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075603b10a2b---kusimurafosuxagi.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/xopivareranojesikisiken.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/tomajiwivo.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/g0gp7bmujm5rm9b99lsjn07sh9/77951790697.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/burivupufemevuwo.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/gijijawo.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/tabopinotilakubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+iceman+inheritance+pdf+downloadPDF 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_off0000ccd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD8 10768 bytes
SHA-256: 2157a41ddd84e3e89b7e03ca61ceed7c5477e7b598800fd618a763180eea77a6
font_01_sfnt_off0000e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 16908 bytes
SHA-256: c89eaf3cd740c0785007351dc853fd1a850bd0fb697839c5d2869a1c442f8552