Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d0ecacc03e730e…

MALICIOUS

PDF

99.8 KB Created: 2021-09-04 04:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 16811a7bb1c0ff6d907f87efa789af8e SHA-1: 62c3ccf86d93dbd1b13e1a87d66cec7a28318e64 SHA-256: 28d0ecacc03e730eef95277863d7ee8c157f930a20b76a3271a7c2e17f5d3ed2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates an attempt to leverage these sites for distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=mansurat+ki+sharah+pdf PDF link annotation
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/309bc05f17741a4a4e7bdb5b6d9d7e44/97739456462.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cc4e01023b990e9e62ff0c2a21efb92/fevewujutadigenumutav.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b83c0b0325a15287fb5d644dd154520d/fibusipexedu.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab61e9a61e1---1972553180.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/51446107649.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/2df13a81c9e5d46704bd75aaf4f98287/61373829304.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/78071088542.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/a171b512d6c288e310dcd4bd840d389b/moguvila.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751985e9f45---58964755036.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/71616921366.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/gikini.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075db21479fa---77394062431.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/53454885840.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6277b22f0---jowudanipekorulumeloxoj.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/bfd2c95e08376493429044a25ba5fb28/15674863072.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/50062404273.pdfIn PDF document text
    • http://one9five.com/userfiles/files/diresibejolarudatu.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/nilurexin.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c22150402ca---xenaxidatituwapolur.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/resevevosusukojotazom.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/94488248799.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b41a67865---6489068702.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/41273935168.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_off00012031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12031 10480 bytes
SHA-256: c21c2fd3a71fa4c213739545e2e12dbf79b110b4a510c69f157d71a90aed0ae2
font_01_sfnt_off000137ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15001 19052 bytes
SHA-256: 15ae2732f3972ce775ba7d3f8341c11cee6fcff7ce8976302ec0a13287ba3913

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