Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5e7358c2d4e69c…

MALICIOUS

PDF

87.5 KB Created: 2021-09-06 21:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 842b6b0b2065c8f4a2ff6cce9d63e352 SHA-1: a3f097937ce910f330387a7605334836d92b3c1e SHA-256: 1c5e7358c2d4e69c55bf61a77efa060b81141760aa2d52fe388ad069a5174ba3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content. ClamAV and ML classifiers strongly indicate this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/vqgdprg2028lkipmgtp7ta7dnv/jewukatowupema.pdf In PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f69fe00331---89667468418.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210830_095255.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/netidozudusevabetirimegor.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084d9a511781---5996804714.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///fekizefetizepodofu.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/forebukijulanawelenizud.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1656fc8247c2b22f89a31790683e8ca4/suzovafudagalebovurapa.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed7e3bb738---tetegas.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/1fa2e033005717aa6c1b60cca9be52ae/xezojibenabukuzapeliv.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/bupixefivewubifawe.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/29772076450.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841ec328898---livexofujozebovulemari.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c96bb50ff5---panudufaxolize.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/girilaxewolurowi.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/18a6d1da5e97a76e4f0eca256949659c/86781893400.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/60576199499.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/44916563234.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/gusujaroxulimux.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b232a8ce996---9454614480.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608712d82cc7a---46409171077.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/bomigoxosezifa.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/iedinl77qll31ns1cnbt5o8jc1/depovozuvoleru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=violin+cello+christmas+duets+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_off0000ecfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10512 10952 bytes
SHA-256: 3fc3b9cf920444d812d5c93d18df1c4e486a3b01c9b6b716e552abcd25876c43
font_02_sfnt_off00011e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E49 18628 bytes
SHA-256: 5d940b08f2c84e6d0780049a03c38104602da10be4545317e89edfab41264a67

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