Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f1da980018d7042…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 08:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be003fcb1d0dd9ce07d1a530ebcf1afd SHA-1: 17fae17bd674a23859f290a584f54ca46dd62bd5 SHA-256: 1f1da980018d70424bf55edb4762448589608b12dd2b6bdcd2cb3be8f8d60d63
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to lure users to external sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document used as an initial attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://generaldistco.com/images/file/6881717569.pdf
    • http://internationalnetworksolutions.net/files/
    • https://radmangroup-ye.com/rgfiles/file/nufaxevunagajagewu.pdf
    • https://manenshop.com/upload/files/tipuzagik.pdf
    • http://metamorfoza-krosno.pl/userfiles/file/3726975925.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9eec6b1f---94585380032.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3953432016955bb518033ecbf04e5acf/guluki.pdf
    • https://carparts-fixture.com/file/file/38422009701.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160def71b79300---19359113699.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/39832948686.pdf
    • https://whiteplacard.com/UserFiles/file/28893221821.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/287695fc6585d2a7e626a15e57f50011/44195476631.pdf
    • https://sbufficio.it/file/zuwuwo.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/25095929713.pdf
    • http://sure2trips.com/bot/ckfinder/uf/files/viwowazixepazeje.pdf
    • http://progfin.pl/userfiles/file/mimuwikopur.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/89a959fbe117bdb009672be487f8bb1b/girupotimatexipogubovi.pdf
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/juriwomamo.pdf
    • http://rosesrealtyhomes.com/userfiles/files/mapujolusamibojusaposojuz.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/0c3dangeohdujfu2bt3f7kmse3/wevizopis.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1dc634ed4---wamukisebar.pdf
    • http://martom24.pl/martom/userfiles/file/tubonawexirilu.pdf
    • https://banghenails.com/upload/file/nuxakulalonijilunimedivot.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607668df3d917---81765156659.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=find+the+greatest+4+digit+number+exactly+divisible+by+3+4+and+5
    • 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_off0000d6a2.bin
a9591054d191227a10a4d7d40d24359bfec3f272c87603d1938025d2e3d55b85
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A2 11580 bytes
font_01_sfnt_off0000f1d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 16792 bytes
font_02_sfnt_off000109eb.bin
819f36f43f72c0c6e4a179f3eca3ae89a73725fb4bdd57409ae0aed0e10644e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x109EB 18744 bytes