Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2a8763aeb00675…

MALICIOUS

PDF

72.2 KB Created: 2021-09-16 20:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8f6e19a26516d8b6acad03a84f65224 SHA-1: ef0e0d7ec55aa2fc41e3f1138edfe340c4619b0f SHA-256: 8b2a8763aeb00675bb7ccd6d30b1f05a16e48a9799c623da5aad8746a03e5f28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://philabc.ru/uplcv?utm_term=test+speed+android PDF link annotation
    • http://csc020.com/userfiles/file/20210913103052_drdupx.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/45394780229.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/82653211257.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/wolerojad.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/gexebo.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/36064714840.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/vapokevutuzapupamek.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/42738408877.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210907054714.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/nezijixegorekituzi.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/80202032520.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/fuwinowagotiz.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/71157458583.pdfIn PDF document text
    • http://maidichike.com/upload/files/pekaxutigejifulepeginefow.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/35408814134.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613474e270f3e---bexafeme.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/jaribiwupuwip.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/35895731219.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/gevofenufake.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/ganoge.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/96309388499.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613203f0dcacd---45483264120.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3ba765ab64bf289f299c443c59013ee0/kizabadadazebotigimerexe.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_off0000b6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEA 10300 bytes
SHA-256: 9704fe9d4baae52d634f4861a0fa871be2a9abd511620a471008f62a9d36c8c6
font_02_sfnt_off0000e641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE641 16868 bytes
SHA-256: d0270c5b8869fc9a3eff82389f2a0bb61f4eb395e16ad7a0de8f9e904bac536b