Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a68727388fcb8d5…

MALICIOUS

PDF

78.9 KB Created: 2021-07-05 13:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cf667b5316a1f6591d04ce41260bd32a SHA-1: e57268111a8c34cd4fac76b0259063b367e437ba SHA-256: 6a68727388fcb8d5a1f88a105dcb881abf34e0e6b385fd6c5f97a99b484afc9f
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites. The presence of a 'download button' lure suggests an attempt to trick users into clicking these links, which likely lead to phishing pages or further malware downloads. The file's structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817c04b8caf---82872111171.pdf In PDF document text
    • http://shriadinathbank.com/uploads/5273803614.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/f589b32f1ca9cd934d59ae8fbb52e4f0/zevonepovukotipowovowika.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/e9e15a14818c7e0c2ad6485bd4b21318/xurorivad.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/17f9e81224b7a3337e1d5e1790d94784/70159597396.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a59dddc7e00---59968295714.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160884461310e9---5303189738.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/bufovafifijigasilibipuni.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/97986190474.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/2b479e9986c49c5f23570258858b6aa0/bulobimeviralefajuvafid.pdfIn PDF document text
    • http://planbmedia.hufiles/12357988045.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/ruvawoli.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/af689f7055ef9eb0944ff21be498915a/sazimef.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210705115944_dx93od.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/780027962.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/95f75502399ed44c347f46bdbfee4a82/gusoxufoxusatodakod.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/67005658318.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/aktnit79ufmfo66cs9qg8rdhrg/noxazebitem.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160808fa560be3---93900517262.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080683e7cd08---53456004753.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/2924a885b04d1c668903c57e64f55fe1/fojoweralun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=math+facts+worksheetsPDF 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_off0000ce9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9A 10364 bytes
SHA-256: 01208b0e90aac08b6f640417864d501cd36200778c76b5d597093feb3d20c14b
font_01_sfnt_off0000e651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 18052 bytes
SHA-256: 33c5afd8cd49ea63fc858a290a7ffec39d322186d5c8a5373bdd50a35808b580
font_02_sfnt_off0001151a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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