Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f3b202fba264837…

MALICIOUS

PDF

70.1 KB Created: 2021-10-02 09:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b16c5dd047112872bd05446a75723db5 SHA-1: abb4bb1e3fbdec90b684eb61ebb8aedccb8758d3 SHA-256: 8f3b202fba264837488e67eb7d5917d27526f4b02c680687a88d0b8d362ea9dd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links, including one with a 'utm_term' parameter suggesting tracking, points towards an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://ketchas.ru/uplcv?utm_term=i+just+wanna+feel+something+mp3+download PDF link annotation
    • http://santamariamikado.com/uploads/files/rumogawapox.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/bazikowotu.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109191552255145.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/gatuvuxeja.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/josimolajibupupufasod.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/74873766614.pdfIn PDF document text
    • https://unitjaya.com/contents/files/13720752366.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/zenuredupojo.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/79450278416.pdfIn PDF document text
    • https://5udua.com/contents/files/nusaguxazuxokakajeninap.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/fafav.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/2020a8ec9a06f7d1abcde76082111fdf/44187180734.pdfIn PDF document text
    • https://hgb.se/filer/file/vozugubiwexe.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/xamonodip.pdfIn PDF document text
    • http://podushka.by/files/files/81172396957.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/50240752491.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161561a46a76af---79024955731.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/nuritapokuniri.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/jg43v6b6kr4vq43md2upkon0i7/rifawi.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e5e20a4fa---gevak.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/97773444538.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/vusudub.pdfIn PDF document text
    • http://artepcb.com/upload/files/74253810027.pdfIn PDF document text
    • http://grabnerestriche.at/tolaxaxijipodanewoz.pdfIn PDF document text
    • http://ubest.ru/images/file/jovojufebinika.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b377864f72---kokobovuxewok.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139f6cdcb16d---rasujajisezup.pdfIn PDF document text
    • 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_off0000b28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA4 11284 bytes
SHA-256: 522fa2fdfab5e8c0d7d2a2cbd0a0b17d6d0aba725487920e37a415f0424d2860
font_02_sfnt_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 14672 bytes
SHA-256: eef56056fdf6c2f8a21e281a7b5379539d24d971cee027d2451d7ea1be17da42

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