Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3add3fede726fe…

MALICIOUS

PDF

96.5 KB Created: 2021-09-03 23:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2fe8ffb0fe4561068fe116ff65729af1 SHA-1: d6cba44bfe79811742b77a1db0f17992e806b603 SHA-256: 5a3add3fede726fe291502427e7003920adb19a397dbfad71a1f24559b669039
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially compromised or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The file's structure and numerous external links suggest it is designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lesartsdansmonjardin.com/userfiles/file/20210820225755.pdf In PDF document text
    • http://sxhk365.com/uploads/file///51113925139.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/90120775302.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/wewero.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/kusufelusutovadi.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/17719326672.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/lumupeb.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609b97c7a8ea4---gojapafave.pdfIn PDF document text
    • https://aildf.in/userfiles/file/71539416760.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/92940258114.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c681ccc0c---79222409272.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/a71bcad31a34b0aed21f059ca552007c/jekow.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61459ca263---guzixosiredimuzozawexogeb.pdfIn PDF document text
    • https://airshow-bg.com/file/fufobupe.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/kuginililelegokupawana.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/gmjf5fpf2rs05cs0qhheb5ql69/pozix.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/h2ael2sjnd8ob8ncr223pcsqt1/madogami.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/motega.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed9275a664---damigumut.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f101938cf252c562613473d4530e7047/43550468973.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e78a6895b62---baninaximodus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=speech+recognition+introduction+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_off000115bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BD 17860 bytes
SHA-256: cfd99b63d079003fb1416fcd0179657593ae0e1230d2e77f51097f642726395a
font_01_sfnt_off0001443b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1443B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C52 10700 bytes
SHA-256: 4e3d43bf8bcd7124a78394fcd079aa2f6bb38a71d9c3190a9bc6e91dace64989

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