Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d81de92a9f42fe7…

MALICIOUS

PDF

86.1 KB Created: 2021-08-17 03:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 273413ccffb26588f0a90bd92168a59c SHA-1: 937e2f464565976524a36c17c967aed647ae80cc SHA-256: 2d81de92a9f42fe781025690419de460df61e28d0a250ee3103a053dc58cb57e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to distribute further malicious content. The presence of multiple external URIs and link farms indicates a likely spearphishing attachment campaign aiming to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://namngonviet.vn/user-/files/15382924342.pdf In PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1132e8bc2a2b2cb2ce7861ed822ee45c/bejisepezorutigunorigo.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/jigapelifolimopi.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/iu843fkiqd05sdgl81fk55lrp6/wuwutiberisafimoboruder.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13ce1f3978---8524818755.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/bapijemunu.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/76ead0b6d50f221b9e735333de46c537/misawapopasigudise.pdfIn PDF document text
    • http://ozari-ua.com/files/file/nuduzamugajetiguxaminorav.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/61238975737.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d099c511e46.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/85768156445.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5f81e557d---5492027488.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759d3e9bbd7---52313813191.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160f112d444dc7---72894057689.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7d7b4cadbed6bb6f6326a08f27da961c/51654018822.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/xifeselatowuwar.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/nnan573ftme0qp8bguo95jonhi/kukexujinigelar.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/9256379550.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/31335843907.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/356c551cede712dee520fc7101282791/bekobodetikavof.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/medajurofuxulasa.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/dorilin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=anaconda+2+full+movie+hindi+hd+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_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001029d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029D 10728 bytes
SHA-256: ada3910ee4ba572a706a83a25fc29a6e446a40a23de0bf99b4def208bacc638c
font_02_sfnt_off00011b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B34 17000 bytes
SHA-256: 60db9efbabfae680c03d79aef353140b29016da859036a5bc59f77789676a54b

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