Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e34daa13aaddbb…

MALICIOUS

PDF

91.0 KB Created: 2021-07-16 03:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c87c4e231f053168e11904bdfe5101d6 SHA-1: 9ecd07e94ddb34321907582b9c77ecb78b66e8d7 SHA-256: 42e34daa13aaddbb417462e899e9e8b58c6ff21391aac7d441044e9f09e345f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=how+to+undisable+an+iphone+11', are likely used for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://synerhu.ru/uplcv?utm_term=how+to+undisable+an+iphone+11 PDF link annotation
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d9cd1db3a---32530752345.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8e1029eb2e---fajavolokofozepag.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b56f1421068f6eeb97d50fffdaeccc1/37428672857.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/b52b808453c70c9d7c27c5aeaef4e665/samunejesuruw.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44bfc54dd7---vijatelu.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/59903701396.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/97424678628.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cc160255c87f139b71f544eacf7d2c1/fojukuruxamewo.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084eace7e045---762006868.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/44904012734.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/reburopovapajatax.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210621224258.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c422fc5ffd9---satibuvolufemata.pdfIn PDF document text
    • https://agermag.ro/mm/file/79979045968.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160727704b7b94---77928523788.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/12667098491.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/59911425351.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/24863276992.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/jadarejubodakudojexomubus.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/7600607b7afac32f88fb8ab9a2aa32b9/kosategonuwosobewoso.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/qeq31iuj3ls10j4lq5lsprun0u/88189231465.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/u184h25kg81lp39j5c7sudmjl2/36620485255.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_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C6 17144 bytes
SHA-256: 120e5bbdf065449275dc7903abc15a62d13a35ead719194db5e3dbf1128803be
font_02_sfnt_off0001448c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448C 10760 bytes
SHA-256: ffe44c2e1686af7d72df51f4e528df952148aa366f5074969cc14029852bff73

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