Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ea3e483e87a828…

MALICIOUS

PDF

82.1 KB Created: 2021-06-28 22:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1a391fe94499cba1cd9de9167073860 SHA-1: 6280469b61144ac1e3aba854e122a8e7b3b3947e SHA-256: 63ea3e483e87a8280784e0a9ac3c2ca53b0e22b50380da35292c01df31da2afc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or phishing. No scripts were extracted, and the document body was unreadable binary data, suggesting the primary malicious function is the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ec6731eafcb68dc8444d6994499e09ab/1236181981.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/f4ae1ca2e3bd1012a5e4eaf2579bfd9c/nopujipovapimojotiko.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/74b69d537b37d474d61bfb3a2d804f49/21854406441.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/5a3439576ac7b0747c398b4815088cb1/41289841633.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0bi6bfa1r6etgr0cgbv4obaesc/tefup.pdf
    • https://spa-salon.ru/ckfinder/userfiles/files/18458122441.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/baa8201a2883dd470d5ac496ba747145/89537817439.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbad216995---fujikexewim.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae02a7ed928---8570699894.pdf
    • https://rhodium.vn/uploads/news_file/dutumab.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bacd7f373---95905318236.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5f0150a39---49148149204.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/n2p3ilt2h0g9m82je86gqm7o11/93935511981.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607021cb6877a---jedenileviv.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/f0fe479831ce7a2f82754035f9505bfd/6106479603.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089be0341944---naporikajotajaxeji.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa1a9cb29---rumuzipef.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071f9d41d6d4---78894840311.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/0dd07faf7d7a883a082a5c991d6cdffd/dupoxojimusavevenilibopis.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bd62638fe---mebetivudij.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb26cc772f---vakejawededupit.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dbc930ae0---xeduxavazusixod.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae96a6ad647---rofejufedu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+do+you+say+when+someone+ask+tell+me+about+yourself
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4d5.bin
abe244269bf652ef622674e8d79f5800032dc627e52016bcc0cda7527533186c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D5 15680 bytes
font_01_sfnt_off0000ecc6.bin
d4e01f0367274c79d1a7d06d07d194cfed8a0cc5c0707f43f2993e9bf025f8a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 11052 bytes
font_02_sfnt_off00010663.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 16792 bytes
font_03_sfnt_off00011e74.bin
10dccb3cdd4b6046cb2604b60ca8c49d6bd1a5eacf3c648681b67fc6aba6d321		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E74 17884 bytes

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