Malicious PDF — malware analysis report

Static analysis result for SHA-256 3139296dcb282e30…

MALICIOUS

PDF

81.1 KB Created: 2021-06-27 15:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b7cf0d9b437709d628df4a36db90586a SHA-1: a7806d317610323b12f5fd16653c1b5a4368505d SHA-256: 3139296dcb282e30de91030371a7d9ddaa4959892bb7cb819159f531cba42b6c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. It contains numerous links pointing to potentially compromised websites and disposable hosting, characteristic of a link farm used for phishing or distributing further malware. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7aa65260949a78267233add3ebe9f076/fanefosemetozisasijij.pdf In PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4c34d48ba101e1f812051d57bbc1d3e/pasupupap.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/34120166901.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2e7b68208---vamemodob.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/pobunakib.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c580c2762abe80db768a62af81ba9102/70069684775.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087e8ee86b38---fexiwitonokatinawa.pdfIn PDF document text
    • http://moristas.com/userfiles/files/worudamoz.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160985835ac2d3---judafazumapupunas.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/zetevobabubamefolaw.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082d70074a34---dekob.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/20052962276.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/balutekefewexelanorizefa.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/ge63eu8jc136dq45rvnb3f7eh7/38704997370.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/efflbg8vt0f1blhsjkcdl1k29m/karafuzozupana.pdfIn PDF document text
    • http://calisnt.com/uploads/files/kubugakotixob.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d7186cd03---tubexifokozupixumarex.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc2b3a3745---16384626717.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/tagukofikisisubekukugal.pdfIn PDF document text
    • http://vonkoenigsmund.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb678b4038---35650684894.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/77644153008.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/97427837697.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be1c9fe4f51---74661089074.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/morawunejune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=robert+bringhurst+the+elements+of+typographic+style+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_off0000d876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 16744 bytes
SHA-256: 871178846abc1029c9a6a0e0fc6d981c36dc52b7581adf77d8b829f1888cb6de
font_01_sfnt_off0001040d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 11468 bytes
SHA-256: 197ebd32d4a519f642b220ed65afa843c974cfbef0a2868581110dfdecbd2c72

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