Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ab7274d1ad9c6c…

MALICIOUS

PDF

84.7 KB Created: 2021-07-14 07:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 658ae2f630377b77c5453b31d1040e50 SHA-1: 1b829dbb7f9353d28b87e3172e408392a74a4dd0 SHA-256: c9ab7274d1ad9c6c2511bc4342b7b4c564b26d610044cf006829ef058d6a6cfa
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://thegioidongphuc.net/ckfinder/userfiles/files/44282878000.pdf In PDF document text
    • http://www.meditt.com/wp-content/plugins/super-forms/uploads/php/files/49vd44gu90unoiil6k9mqui5qs/rifejokavogovomadufuf.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/gememuvexevi.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/4ba604b6f5e7cb18b027ff3663cd75cd/susitevufumozupasukefe.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2b9f8831ae580c5b2c87ff3b0b602bac/zadajewiripureteseri.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/s2qja5ajo51in5pg7g6lfch11u/paxupef.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607827ddacc50---dizulitajugapikumimusemat.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/ganunomal.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/xaverupokopu.pdfIn PDF document text
    • http://princeverma.in/uploads/files/lipivosekigiveja.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a5335303aa1---zutewenedugapalaluwefatag.pdfIn PDF document text
    • http://rurisnet.org/images/file/24727313302.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/76648510975.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/53994872961.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/3c61e57675f8aa9fcba9ea3b2b6761ef/45605767566.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/mivune.pdfIn PDF document text
    • http://jngf.cn/files/file/welexofewokowizi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fe27139268466cddb7a75bbb4e1d4ac9/dotasimaduferogibetoma.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/91151661145.pdfIn PDF document text
    • https://yuss.it/file/25652859989.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b96770256d7---78259288834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=change+text+size+in+fillable+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_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 10892 bytes
SHA-256: 5d75851cc67f1d51469147a469c4942722bd38cd8b6afef1153efc071fb08857
font_01_sfnt_off0000ff45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11757 17148 bytes
SHA-256: 5bdd41002e90c4fb2cb25ffc654184f987dc955d1b2e31b42f1d8e16071270de

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