Malicious PDF — malware analysis report

Static analysis result for SHA-256 54cdb0b50833dae4…

MALICIOUS

PDF

88.4 KB Created: 2021-09-12 18:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f727b740aeb1a286320626faf1321e80 SHA-1: f0ee7edc5cc4125cb702030653dd3c31251d11fc SHA-256: 54cdb0b50833dae4c23f428b5d4ef6bf35df1235f35c2b57f5d27cfa20a5a9c0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=android+stock+launcher+apk', suggest a lure to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=android+stock+launcher+apk PDF link annotation
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372c5b7a67b---98286904966.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/jopedazopabavurutatajo.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/82262029289.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/vukig.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb034c6d5ef1a0fbcb50777d81b63490/75841749276.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/nales.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/fivajajokokopijujeforatax.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ba7456fca022061570a8631c45646f90/dumovojonemiwomu.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/3705728589.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/nuxafigozurupowegesitu.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/15486999546135bb5275316.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/939c2696b9eb3c696c55b093d7a822a7/febebefapulafuwapo.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/93596322707.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/nibiporogezidovagonepi.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/36589401571.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/47478182350.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/38197527237.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/36397394304.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/penekoxefifiwana.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/takafefasawisodenigi.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/fatunoruwamejatagopevow.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/92059154416.pdfIn PDF document text
    • http://btfa.tw/upload/files/39173278786.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/vujakufinenabifawavipiku.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_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D78 17648 bytes
SHA-256: b603796a304c9783bf8eac9328f1416f3f230aeb33ac14b03622b8321ba7106e
font_02_sfnt_off00013b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B71 10784 bytes
SHA-256: 560c663d1273d5b80d0b44b9b4c16d53c173190eba0cc9820df9e5214ddd7692

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