Malicious PDF — malware analysis report

Static analysis result for SHA-256 273c1401197e1c1e…

MALICIOUS

PDF

91.5 KB Created: 2021-06-30 05:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21d6dd3bce814b22ea44a90035e4888c SHA-1: 367e86cf27766cb3c03537df9867a6381beab603 SHA-256: 273c1401197e1c1e8529fe4a9225f4dec4f46e63fe98e72c79099b81b927aaad
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content via these links.

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 http://dambi.pl/userfiles/file/64946426947.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed4d56842d---95191103362.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8d1e5993a---61546941750.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9875d3b0307c3e6d93b9e41c1cc83b8c/reverorenafajo.pdf
    • https://llsindia.in/FCKeditor/file/25858025921.pdf
    • http://groupkaishan.com/d/files/72042806871.pdf
    • https://maintogelonline.info/contents//files/wemalefevuzop.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/l4bsabekkgc8oplvf362lehn7a/sowalojugonaneji.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8df7b1f30dad13ef160da5a11c10f57a/mazilax.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ca64ff468d1b4b508d539b9becc33747/luxifixufiduvoga.pdf
    • https://mvpartners.be/images/uploadedimages/file/xubom.pdf
    • https://baxsporthorses.com/userfiles/file/rukirokobitem.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0bb85de28---28474693837.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082b30f261b5---74297944495.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/togixurufujemewuvipol.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/g36tnni50jako1unjoupq2l6k5/7690949710.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/bba89072d8c9532992985e1a4a1190ae/56211377066.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077cf15628fa---rafebobinejux.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9530ce818---92892207216.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/qsj8ks8gjgr68sjds2cknh5uk2/vupuribukodunul.pdf
    • http://olympusflights.com/files/files/seraga.pdf
    • http://imhkayseri.com/resimler/files/19118552089.pdf
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/sutegenasonezarubizavusel.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=shows+to+watch+if+you+like+steven+universe
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffc8.bin
2bc92c367fa70fb19bac3ab84d24dfceed060ac855b5fa34dab94db556556cea
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC8 18344 bytes
font_01_sfnt_off00012ff0.bin
e40a8bb33ddc0ebde2a00494d86d82ecef5ceb09b741a569815c5dd14aa07174
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF0 10968 bytes
font_02_sfnt_off00014972.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14972 16792 bytes