Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4dbd20cc0f1b1d…

MALICIOUS

PDF

91.8 KB Created: 2021-09-03 16:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 429a54f649b8c5c756cba224d1b29dc1 SHA-1: 03a58b27b9138c658c7b87794b0d32e196170edc SHA-256: da4dbd20cc0f1b1d01869741e49c711d3a7ca2698f5e610f59f738d87bd46866
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised CMS upload directories or disposable domains, suggesting an intent to lure users to potentially malicious sites for phishing or malware delivery. The ML_NYX_PDF_MALICIOUS heuristic and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://hainescentreasia.com/images/file/zazuz.pdf In PDF document text
    • https://reparationmobile.net/userfiles/file/lesisulot.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/37305651938.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/kujimiraj.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/93735139525.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/99f97d558010c82e9e11661a9461a38c/xaman.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/58a806c0b8c10bd2d25bda3ab3936a1e/notalojepuzanejadipizeso.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/e86a2fe1e0d37d9833d1a46076b973ab/gelepavom.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/9ufekdf68f2hb9n0rjsab1s234/48367114233.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/gepedolusigojapu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/39002b6933f7cd4145827fdb032cc3ef/97715178961.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/goxokevitewipixofu.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/bajubomegekuso.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/42395228558.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/b1fe7dab3b26b3bcae92394953a97761/tutanivotiduwuradisetazas.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824ace27168---11535240017.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/30911932067.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124575e8a775---9448667825.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607042d4549ce---bovutofopogifubol.pdfIn PDF document text
    • https://renewone.de/files/95552489069.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/36507497607.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16092d4ad33b6d---xavijoropexatewesog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=descargar+la+iliada+resumen+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://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_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 18572 bytes
SHA-256: 42a327891f7425a8ccdf7a76a690e82c1581c96b45d10f834b6be5aa39666adc
font_01_sfnt_off000136ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC2 10844 bytes
SHA-256: 8de0005b8328b4a2677d35869a584bfebf24cfa486989dfd6c0da2d55ad4bca4

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