Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9b4e1418cf59bc…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 22:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d2628b8bd53e9e98268a1fbe31a6c2b7 SHA-1: f01da239b9f772e3675e1d9849aaf5afe22d2f38 SHA-256: aa9b4e1418cf59bc6071ba64b8c29627213d32479a7cacf1facafb9ce619e4da
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.vpn-solutions.com.pe/ckfinder/userfiles/files/nigunedotukuzi.pdf In PDF document text
    • http://pop-around.com/file_media/file_image/file/49305476936.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/93282521771.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/tujafoxix.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/29757139221.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/12323691677.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/kajesibo.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/bc39ab80a6a0e8749b27c00d2e1f3f8d/38397304642.pdfIn PDF document text
    • https://tangente-mag.com/img/file/kakanavibixom.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f07ad9c37d4---42357669338.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/12020587908.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e23c5c18a7---70620884346.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/zogijosubej.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/27181445378.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/bosus.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/sagunumupalugavumudirif.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a54e6518246---kedudamepufowaxabovotob.pdfIn PDF document text
    • http://hncastlecable.com/d/files/gagavakin.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079d45e8d7e7---137358281.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6e5h7spo7j2brta8etjegd1qf/sepap.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/5iu911jk892ger8j0nmjfiu4l2/wulosiravoguneluzeduno.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/92820624061.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/31184950666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=signer+un+pdf+sur+smartphonePDF 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_off0000d7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C0 19528 bytes
SHA-256: 0010a8227116b769b16cb480c834d50e73ffdb486373fd280d6bd3a586db733d
font_01_sfnt_off000109cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 11076 bytes
SHA-256: 0d6a334cbcba68a3dae913ba28f75a1b070720eac4cc38c613c1903453d558c7
font_02_sfnt_off00012331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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