Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdae723e0066018…

MALICIOUS

PDF

82.8 KB Created: 2021-08-20 16:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e443653bf0972d8c10d3a46033d8397f SHA-1: 73652b2f77587a277a6dcd247d62965aaa7e3117 SHA-256: ccdae723e0066018b66031873c3470b602d2b10a0f012ac995b32ba107c17d7a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to lure users into phishing scams or download further malware. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b450e6edaca77327381bb5093f475fee/lotubesosigigiru.pdf In PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e47a1f359---71714134527.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/54781291815.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608afe5900e26---17816239257.pdfIn PDF document text
    • http://benly-carson.com/product/files/xeweke.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/metini.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/jepijol.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/tomalaximakidajol.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/9366629344.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/n4deiuotfk9vlltkceod79ii83/23277385136.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/milutumutokanelu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abccd6b2eaf---27581426030.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/gakejedutazetuzosudubim.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/molapipuxevixi.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/sixuso.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/qobgm98feg0prcuvd50bu3gkd7/biliresoletemakobugodofa.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/77257648619.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/peguk.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/54782354140.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/29a19534e8f82dabde77f8cff196480f/mixumokofudasinonipowor.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/c9c670f77ee3b52135ab604a966e741e/83876137609.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d14cc80a---surajuboxevub.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/bexad.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/7jk5456eiejec7shr75l7c9sa7/wabugavuvifikijukexigujuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=watson+glaser+ii+critical+thinking+appraisal+form+e+answersPDF 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_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 16452 bytes
SHA-256: ce8c86cab64b5686fdce199ac49dbca5a338b2b7b959c52a49bdf90178e96ba1
font_01_sfnt_off000109e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E2 11100 bytes
SHA-256: ae2d41545883dd29c6ce31a968e02619fab7ae9749f97417d7c6c9947679992f
font_02_sfnt_off000123ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1