Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c67d0abab8e847e…

MALICIOUS

PDF

70.0 KB Created: 2021-09-13 09:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8a64b84ebca293eb06fcef1baaf83a9f SHA-1: e28096bcc812bfb6ce98fed4d8a6738184612e74 SHA-256: 4c67d0abab8e847e0840feadd22929673a17eaa90d3deea3d27ee1c471748b1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gesema.com/UserFiles/file/vuretebukabumawujo.pdf In PDF document text
    • http://szwygs.com/upload/zomuwizokomosodiwudab.pdfIn PDF document text
    • http://peoplefoster.com/pliki/28320386130.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/26827602568.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/57279116720.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/kuxegawudor.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/44460280440.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/xozukisavolevo.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161341bf538e80---38380281155.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/nukumeburupotesexop.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1b19536900b3d14a5d398f732bf13a10/3583296440.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/fubezidutopar.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/r93j5kn5l7r8moh9nmrbjgde89/zepatab.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/salilub.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210913_979A494D07BC99E4.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/40553130891.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/13250606168.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612feba27bb4d---85587869961.pdfIn PDF document text
    • http://taociren.com/upload/file/210912010214836002jfetw73kjjxi.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/26011022396.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/wonagirogapisepevimiw.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/befalaxitala.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/46659318003.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/17170017310.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/matamexufibolonipuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=topfollow+free+coinsPDF 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_off0000b787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB787 14312 bytes
SHA-256: fa0841a76f40801eec5d45f29b2d73815839e1754ffd3eef13ec73bebef3917f
font_01_sfnt_off0000dad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD9 10264 bytes
SHA-256: 6678eae9c6983ba032154e458147a5f33241b3ade2f289f7f3779ee99a1df025
font_02_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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