Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b647e58bc75de6a…

MALICIOUS

PDF

91.0 KB Created: 2021-09-13 15:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8245e066853366a0a6dd7d844fe53e26 SHA-1: 6b1b1c6e2bb7d7b5b73bbcd7680b6ca83d5e7c8b SHA-256: 7b647e58bc75de6a0a7db4fc9b0cc7f10d582305a82552f1796e726c1eb96a76
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised websites and disposable hosting, indicating an attempt to direct users to malicious content. The presence of external URIs and link farm indicators suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cpsguffanti.com/uploads/file/40480002780.pdf In PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/waxixozusokevimiwu.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/fozawivofurapafaper.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/lagigiwitipita.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/mupiwinofulanugikad.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/dowarokagamevejirarepozix.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/23455686712.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/dalurelezevupida.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/kuwetokasagota.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd28e8cd4e---golumuri.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/8b588026f10914a5e8f1a2b6b33ac3e7/vezuwiduvalifal.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/gakimusuwob.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/divapojoga.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210903_213827_9641.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613297682b419---pezegixobatuwamuzevajago.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/basis.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/dalesavakalefowaxapisutel.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/47e228bb0ceade950f51fb5333410ea7/92097693817.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/jopejusapemo.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/87752310887.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/lelutusujokulumu.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/zugavipowesedirogadururos.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/80502409267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=dragon+ball+download+apkPDF 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_off0000fe7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7F 10396 bytes
SHA-256: 17adc135d6e3810f56c7403890d7cbfe8c307e3056e6fe1e5602fd2b21674ddc
font_01_sfnt_off000115ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC0 18660 bytes
SHA-256: de04d861c0557b55e5b0d2d7f9dbe27e7d54f150846ab7994390e2c03f15512b