Malicious PDF — malware analysis report

Static analysis result for SHA-256 5125789b86f90b52…

MALICIOUS

PDF

89.9 KB Created: 2021-06-30 03:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4edf208f833433113eeec03904e552d8 SHA-1: 36998e78ec2fb46999b1edc56b0f7441284cbc35 SHA-256: 5125789b86f90b5276c42fa664de0d0be61a4be54a134b887bdcefc118e38584
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, with numerous external URIs. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of multiple external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://infrive.ru/uplcv?utm_term=wide+forehead+and+high+cheekbones PDF link annotation
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/rir4ag4us9kmqmo3bk0kjuno22/56092583616.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2764d2565---9762912620.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/6uhvedukpgrdu9joc8u56n8ibj/luguzipujirosot.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/8vtrk31b134181dl58hc0o50g1/kexifefexaxerekoronuxad.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/62c7431814f3846aa58ca7de28c6a2b2/70833307965.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c56cfb506c4---mugimozosunumogowudux.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/2c9fc7daf9710225f49ffc061dddffe4/lumifoxig.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/84221671125.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160908cfb289f1---11162168723.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/56519216212.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/punivanosojefujefo.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/79735667342.pdfIn PDF document text
    • http://k1a.ru/images/files/file/masunopebevasi.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/7id0tkj0ibt5trbggga2alvm3d/kepewalitawezifevatafiwa.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/45181370882.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/36839747289.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/92319785505.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c8d52f7f4---36694250946.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60db9c4e92---texufu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899fd25502f---veriwuwisanazon.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/vi9q64e5djnr83asjmg010ahgh/jolexunexuxosatowel.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b4511f2d2f8---kevasodevokegoledovopiji.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4b481339d---45101666928.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/731b30e07eef7ac259e5207d067bb772/65248124839.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/70orhhp2ch8eu4s24sfrmhe417/53926747240.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a2615e7139f---kivodusobuxu.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b6bb1494dcf65d45ebb9af3c964c0df1/8211473235.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/wabamofamuxufirosoxa.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_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 17624 bytes
SHA-256: 6575552a237b249e0b87374a64b064a201fc9554920b83e4a369f08b0710935e
font_01_sfnt_off00012920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12920 10836 bytes
SHA-256: c0cfe408b6af5f5b8c8862484e1faa5face4146fdae916470b6773fda20002a3
font_02_sfnt_off000141d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1