Malicious PDF — malware analysis report

Static analysis result for SHA-256 0535ff4ad86c30d8…

MALICIOUS

PDF

72.5 KB Created: 2021-09-05 22:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 057ee566dc79c2e6ae2a1a5ea57f8caa SHA-1: 4159359a2158f66e5b8f56915ecf16a4f8e6b381 SHA-256: 0535ff4ad86c30d8ede9eeca77d3e69c732a8880001e05c6a3bf02e85365b35a
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It utilizes a link farm hosted on compromised and disposable domains, suggesting an attempt to redirect users to malicious content or downloads. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing and malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://e-skala.pl/userfiles/file/mapitivikozus.pdf In PDF document text
    • http://jar-ted.pl/file/furerel.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/fopupumasapatuniketi.pdfIn PDF document text
    • https://birutelorasin.com/contents//files/gixemus.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/sofirofu.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/18628624882.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/63838283191.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/waxuratubanerinukexa.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/70635208698.pdfIn PDF document text
    • https://alajuusa.eemedia/contents/file/dopika.pdfIn PDF document text
    • http://farashimirooz.com/files/54929612888.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160731bd27a52b---52336050139.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/3983064577.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/jobitapemupaxeduwuwareri.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/zigojufejexuzeja.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/f2ca3608319a7a46f10e1e27db232ce9/8123048583.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/90170969472.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/41453944244.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/lamojezikebe.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/zupated.pdfIn PDF document text
    • http://klefmarken.se/upload/file/51259893789.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/18629013522.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d361d92bad---wodesaxep.pdfIn PDF document text
    • http://vce34.ru/attachments/file/sonibezibinirusigexe.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160e5eff6434af---53345181046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=google+calendar+user+manual+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_off0000b8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D0 16692 bytes
SHA-256: 218cb6b7c1bab6e53a71490f9e51e0042e59956ea63da8ef0b32a08a0fed67e6
font_02_sfnt_off0000fb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB94 10912 bytes
SHA-256: a005b3ca590d910d938cac1aafed724a9d6a58aed1b58c8d94c25efbdbff28ff

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