Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9e75e355564079…

MALICIOUS

PDF

87.9 KB Created: 2021-07-18 22:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 522bdc71d3f5cfc8ba7ef165cd897fcf SHA-1: ab0febd3b302fef05dbd27c280e718afee3e08bf SHA-256: 8d9e75e355564079724b3357e8397b7ea366b4296f0b8cc6b0ca0f520c0d106d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDFs. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c789219740---15643405813.pdf
    • http://ymy-tea.tw/upload/files/jawupejuxuderetavat.pdf
    • http://tsg-edinstvo.ru/userfiles/file/71256825423.pdf
    • http://askort.pl/Upload/file/wuzizirinuxumufobugo.pdf
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/f282e0b35c2051c0780d755e1446ff10/mamanonuxo.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc27b3fb72---38387399128.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee357e91dd7---29026837716.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0458f620f1480b3aa56fc23260d049ff/foremuvawumema.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ba06ad8a9---85277198423.pdf
    • http://homelife-superstars.com/image/files/josupijovubiganulo.pdf
    • http://mousike.it/img_ins/files/fafeforitomaxokaf.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160716a3b2703c---95287966869.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/3d71f0728abde5f1ff6d0a1d3a168588/42948429996.pdf
    • https://cafesca.info/ckfinder/userfiles/files/7600055643.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/dbc9f38f637ec59c4127bc41a75ed1ee/56598732944.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/369ff34e72d6e00ecea029af8cc02596/47891499766.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/70deb7b989d934e5ebf289927a4f945a/94519931123.pdf
    • http://gerd-pollak.de/userfiles/file/35774413822.pdf
    • http://klinikoral.com/img/userfiles/files/pubedu.pdf
    • http://cbcom.eu/ressource/site-image/files/82480988166.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/03c0683b27dbc0ce510afee0f862904d/wibererefawafas.pdf
    • http://jshtextile.com/UserFiles/file///72647500019.pdf
    • https://calmoinc.com/upload/editor/file/ruzofaliduxul.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/908cec13b8bb3a61d56ab17109b84ef5/bopebifokadononokatekupi.pdf
    • https://alutat.com/data/file/vewum.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=china+telecom+delisted+from+nyse
    • 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_off0000f0d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 16792 bytes
font_01_sfnt_off000108eb.bin
53d9e90fb6360ee25026abe3a64e6711240148b189c8417b3229e7c574968994
pdf-font-stream PDF embedded font (sfnt) at offset 0x108EB 17872 bytes
font_02_sfnt_off0001379e.bin
8d64f7c7e098dade504abcd085b474b38094c8d9ca2b3449793a387bf63926e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1379E 10888 bytes