Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0d8da2b033436f…

MALICIOUS

PDF

87.3 KB Created: 2021-06-25 21:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32cc3ca4b3f8aff6b3c4cf679ea9da51 SHA-1: 76645c081b3ef8c8ad1cb75f1ba2f7364c2e84c9 SHA-256: cd0d8da2b033436f507a94bf5a67d1bb5e140f0e3d3e1cc4f8db7aabc1d9ffe0
96 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious and contains numerous embedded URLs. Several of these URLs point to compromised WordPress sites, indicating a potential phishing or malware distribution scheme. The presence of a link farm on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://amadpich.com/userfiles/file/74933688715.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7975593ece---sonoxokebawijuzafixix.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ea272273d---voruxojunawetagobozap.pdf
    • http://bpsstudio.hu/uploads/99629847799.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e5b04c00c---votuzatugibirofejuraniv.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24357d467d---94527562635.pdf
    • http://koyomisushi.com/uploads/files/46249651841.pdf
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/91285777651.pdf
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/55892220660.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/166df3d26d3a725c6680c59de08b09b7/32245164080.pdf
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/98857419422.pdf
    • https://bluetact.com/locktactyuma/userfiles/file/dufola.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1f43bef9d---newefuka.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/bef51f392e9c00d6228449211678d1f3/14018621862.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711436d5968---zinibogaranodipifivu.pdf
    • https://echipamente-scule.ro/userfiles/file/29865331075.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31cc0c424e---vatelobutenadoranamitigom.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f309e944c2---67744039428.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2dff0badc---jipapibuxu.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d160afe56---86578115463.pdf
    • https://malashealthcare.com/userfiles/files/golokirurage.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850f7a734e7---xepejejilixikegosit.pdf
    • http://sushikyototogo.com/uploads/files/zupolilatosevesobi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cell+wall+structure+of+archaebacteria
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7316c7c84f380ebb0202526637a100a3/nafuranijuguvusagapowez.pdf
    • 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_off0000f2ab.bin
6ded9d15d0afc6497076ed7a7a7258fff89baf5815b1d2183b2d8d2a39dce9ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 10684 bytes
font_01_sfnt_off00010b64.bin
1be72cb444fe23b506acc97784fc74de8126a9c7bedfb384eece3185a4e4970f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 17180 bytes
font_02_sfnt_off000137d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137D7 16792 bytes