Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a0552fd7d5d81d…

MALICIOUS

PDF

87.1 KB Created: 2021-09-10 10:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8e571af98d252bca97a96ef291a2513e SHA-1: 3040d79b3cc7c94bbaffe6059f7166ddeded039d SHA-256: c5a0552fd7d5d81d55091007d86cbe0bfcd4b8e1fcf21dffee71d39ba1e82b45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous redirection links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=indian+idol+season+8+judges PDF link annotation
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161315f41949b3---73117561233.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/5383829870.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/wavifawewosiwon.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/xodewokokimil.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/lozufotofoxazolanimip.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/xanazikinobasejipeginiku.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/90353439034.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/59229994194.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/65530885380.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135702cf2e0e---65735183178.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/49049353359.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/gesiwidovuvovusi.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/filika.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/wikifasonufanidoz.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/1753341517.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132276231a2c---vedibalizuwajaw.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/66246223345.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/kedafiwekevu.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/fased.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134332ccb8a2---kakobutuwujub.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/98905569950.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/55441069408.pdfIn PDF document text
    • http://idcla.net/upload/files/52580850618.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/zemumowuginesorerut.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_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 10612 bytes
SHA-256: 4b941d8004de4a661677d818fc3befca39832efb757bd33ed2fc034c66e1a883
font_02_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 18020 bytes
SHA-256: 0ee287920a71262f195dcec2f786bdbce9f11925205b108a4202e49b5ac33a59

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