Malicious PDF — malware analysis report

Static analysis result for SHA-256 37412cb2cb3f008f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 08:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fae34723c0449d52757bf64626202e57 SHA-1: 26613af4bb2550e9b48e116f3f9e0cde2081bf28 SHA-256: 37412cb2cb3f008f44a664c67e17f3439a0cc039a67a0ef402f4a39779d89c13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as a link farm hosted on compromised CMS uploads, specifically WordPress. The ML classifier and ClamAV also identified it as malicious, likely a phishing or trojan distribution attempt. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0343d3481---buravuvufek.pdf In PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/pajosutaviwudesijejoleg.pdfIn PDF document text
    • https://izr.fr/files/23493559858.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/suvit.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wewavovobawobi.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/rumulawusubo.pdfIn PDF document text
    • https://halkum.rs/files/fomodixesumojefalu.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/raroreruwodokisalawo.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/gojekedeguxigozojeku.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/mugirepokupigewakiku.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/65185508465.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/xukagerizuw.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613808fc8ce69---daxirokijapaxosusutubu.pdfIn PDF document text
    • http://darec.sk/files/files/86683376878.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361129124ac---42385227954.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/8b45c14fe0727ad28a8056e333607011/12686870934.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/72113516249.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/joxiv.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/gobofulem.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/tamigupo.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/19364452297.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/1j12uti0647bjhdfcohp7iv83p/85717240858.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/somigalibitamiwilene.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/lopojutikokugitele.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/20149656280.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/p953klprjkvvltdaf43nu9hut1/watovifozufewanogoxeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=mod+apk+coc+hackPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD377 17924 bytes
SHA-256: 040b55f2514d9bb9bd27213c3a2b7d53b627424e9a7d349540e58d2836cbdd92
font_01_sfnt_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A69 9956 bytes
SHA-256: 7796ac55f3be8fc0ce4cbb2ed83a7051529126b261ef690300f73a01efa9330f

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