Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fcce3f399666905…

MALICIOUS

PDF

79.2 KB Created: 2021-07-02 00:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 183154041018b01a08605f4410c16d88 SHA-1: 69437decdebecf6a36219d48870d9abec79f37bb SHA-256: 4fcce3f399666905953d862fa8797515e730628c7b9d3d05d5ce8567e1b65b4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not appear to be directly executable, but their presence on compromised sites is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://nibrasimansch.com/userfiles/files/56880476027.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/269mrfo14p25dlqi9i65n1b8f6/dusipijaterokewoz.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cdc4727ed---37751057031.pdf
    • https://villamishkan.com/310renonew/front/images/files/97902150411.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a75c1c8dc30---nupedorurobovure.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/3m2ono8i0p77lmrg8p2281t417/36049765680.pdf
    • http://fullx.net/files/bedafusanexipage.pdf
    • http://nessium.fr/userfiles/file/gixifisukeb.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cdcf0e7bf05---womijomodaxutozalekuximum.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b111da81b1---vekikikesidosonamogibafa.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01ef6adef---piparivaxotopo.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d38c1eaa2ce---xepewodo.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070ebacb8461---96139628294.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160723a5f77c20---xamurapimafojawonoletemiv.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/juvisanejutukajuje.pdf
    • http://aps-mes.com/files/file/tosapexawuvito.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160834830336f3---46278835593.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d627064bf7---92304040285.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/23e2066ed676232a78140513173c41c5/wixatekorimuvibef.pdf
    • http://broeinest.org/ckfinder/userfiles/files/ninusibenopojabenefiwifiv.pdf
    • http://botosani.ro/img/uploads/file/jomipot.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0d6f4b084---pubexiliparurel.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d439586440---kukewira.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=luther+vandross+it%27s+all+about+you
    • 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_off0000d4ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 16792 bytes
font_01_sfnt_off0000ecc2.bin
c5e233d3e8e079698520c050ac5aaedb729c3d4a4014b3210bb24d772a9277a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC2 10756 bytes
font_02_sfnt_off0001057f.bin
e7d946d2e19f45abd23369ca9733da34a1f355c55dabf916b33acdcb2e02b24f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1057F 16316 bytes

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