Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92426fdb29eaa80…

MALICIOUS

PDF

77.8 KB Created: 2021-09-15 13:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cf9cce866539beb720c1eb7d23a633b5 SHA-1: 988996c000eb3ae88a9a0dcb40ddb64dc370af24 SHA-256: d92426fdb29eaa8089b3de8b7ef00a7e01ce04a371c38da9171bcc1cd37dd67b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161320c57d3e2f---70043335254.pdf In PDF document text
    • http://phone-server.com/userfiles/file/kawazumobo.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/rejigenigopape.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/bidogalagakiwajamuru.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613692c37b5bd---tomusutu.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/94108778958.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/xoxakofudoluwojebukeku.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/sabopuzedepol.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/27964699494.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/zibalegufig.pdfIn PDF document text
    • http://centromp.it/userfiles/files/xeponaxabogo.pdfIn PDF document text
    • https://southafricapools.com/contents/files/26518138192.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/11420130507.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/kekanokodidesin.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/kidowixisisoxi.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/kazodemotanasupazekige.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/48016836770.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161415e6ab022a---lasusirisosuka.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/pigoripisixapabamek.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/14554162712.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/nafakuzisotipenozalon.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210904115502.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/zuvuwuxilodubekewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=game+upin+ipin+offlinePDF 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_off0000cce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 17452 bytes
SHA-256: bba6bf4b3d94b8ca30124168a1cba912d71bb3a43dabe286c793a6435544f1bc
font_02_sfnt_off00011284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11284 10292 bytes
SHA-256: cacbb80347de0df1c4dd294a5a48cfae894ea3a51f050e24ec533ba3d843b964