Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b98b215424d3f2…

MALICIOUS

PDF

82.4 KB Created: 2021-07-01 11:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 595c45a52661f5b02ce304d2eaab913a SHA-1: 771cfe97209f65cf6f8d51e513c522a68a73e2d4 SHA-256: f3b98b215424d3f2f6b7f11df8a872dbaa6e08b5e2292f403ee6fb7b3d0e0254
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the link farm indicate a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/eeaaf72e19d63d181acaad7090e23093/jofuwizojinuvuxasav.pdf
    • https://emauto.lv/index/images/up/file/82049028128.pdf
    • http://annassteen.com/ckfinder/userfiles/files/8240206493.pdf
    • http://fields-on-earth.com/xikirakufaxanew.pdf
    • http://nomorecpapmachine.com/userfiles/files/48369277276.pdf
    • http://attlas.center/userfiles/file/pedufafelalefozukibez.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/30ef9b23ba2965b3ec1489dae1d6d560/sejov.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608477608a201---vuvojene.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb4a0c1320---86558158001.pdf
    • http://clubchic.lv/c/i/files/84531176962.pdf
    • http://drukarnia-skawina.pl/app/webroot/media/files/zimiw.pdf
    • http://watdoenwevandaag.nl/upload/texeb.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a66fb7b7542---lewifukupubadodozu.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9100cb667c---kemolenorexugiwuvopeluw.pdf
    • http://shuswapladystriders.ca/userfiles/file/wavarupopokovakut.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930436e3de3---gifafivomakupuza.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16212393255833.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ceeab36f2---fapababomux.pdf
    • http://ros-grad.ru/fck_editor_files/files/8959208515.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/5c73e7ff8425028138b8134f1398bc4e/60109828801.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073435c00777---zavatovizozarupulub.pdf
    • https://addsfly.com/userfiles/file/fedekufiverevukuza.pdf
    • http://polyalpan.hu/_user/file/36377022189.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+add+cells+up+in+excel
    • 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_off0000dd9f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 16792 bytes
font_01_sfnt_off0000f5b1.bin
bd19648dafcaae4466f893273d740a0338d90c5c78c67bcb596fd9361e8354b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 17136 bytes
font_02_sfnt_off00012270.bin
4973ea12c99c25ca061717783e489a78269a8a9b4eb11bb961bb3887e4dd7f49
pdf-font-stream PDF embedded font (sfnt) at offset 0x12270 10684 bytes