Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf20f70abbf9b72…

MALICIOUS

PDF

81.5 KB Created: 2021-07-02 00:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bfcc8ba371879dd7d25878efe4ea24e8 SHA-1: b3c410bafe0aad3d6f693439b1d3f154c98f7b6c SHA-256: bcf20f70abbf9b72bd07361bbc1b197d2cfa0398d308b884e3143b829912fc82
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. This indicates the file is likely a phishing lure or a distribution mechanism for further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bioident.pl/photos_fck/file/70470675463.pdf In PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ec0ec66c1---titaveberolado.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/480d92b85ef3db7df58c45c0546406bc/93559883370.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/semafifedizipalol.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/mevulokizugisuf.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f5b718fac---83199584685.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ubogn0ag7csa23rcbjsqcvpih6/52027336530.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9d921cd9dbd61d54ef1bdd788f17a19a/49374157832.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/nubof.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2cdfc4764---dagabuzolezewez.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/93261855051.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/lvmuhvucb06r8e78ulksmj3e77/20899337174.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824282ec53b---96809443080.pdfIn PDF document text
    • https://anfauglir.com/images/file/paputi.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/gujiq0md2h4kji3sm6g8c4ot9i/midekenudik.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d810693dc---23155762939.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a4413dc1b---fisogowidigudidugazejago.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/16229648648.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/uj9ivm676j59l5hsl0udhq9t42/zawuwipuropo.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/doromawafa.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6aa419852---lovorinumizomup.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/xenodaxivedizikim.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/41350628569.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/687205a105c1aba64a752f45d67256f0/xutesofapatu.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ih1addjlbsrl8m19hgckj2eth3/54903186260.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd49ab6bf4f---tiwisiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=direct+variation+calculator+tablePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BB 10360 bytes
SHA-256: cfb2cf2cd0c0b5d289e0e62267c4e1e7efa66f40f40078dc4c802b4dbb8d9027
font_01_sfnt_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10458 1768 bytes
SHA-256: 17cf91cbd8a1760c94263355cd17d6c0e5a9c9e083bac12ed29478256e36a7e5
font_03_sfnt_off00010cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 16704 bytes
SHA-256: b5124e4fca475ca4d988433bf6fbf3d35de4137d85a60bdda35984b9c5a57abb

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