Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3648af62d87b09b…

MALICIOUS

PDF

71.4 KB Created: 2021-10-05 16:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d8d6f16d29f8ec75505397dbcab50da2 SHA-1: 5844b70e26d0490c75e366a4ffcb8196db695ebe SHA-256: c3648af62d87b09b25972b065ae77edeb04e308d64c34a7d61b1ea1d5f57d433
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also includes numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://net-marketing.hu/images/files/konuk.pdf In PDF document text
    • https://vjlabor.pitscovn.com/uploads/Upload/files/woxefemaniwi.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/49532598454.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wadibolosizurosuporoloxi.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/babejup.pdfIn PDF document text
    • https://binhvi.com/upload/files/jifaliwawitaloduxulaj.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/20332198740.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/12645737550.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/7e095e677f9bb7b26caa080daf066133/nitofixefesebivutolikin.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/poxemetafimo.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba862e7c66---bezejijapuledufiwarufiko.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39bf51ff9---bimoxulobagalopukilewow.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/dazegivux.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/47389755750.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/3a2320facdc0208d6e77a73962d0c1f5/ruzekogurufurivoguji.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613d75ec541a6---97569945574.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615933859bf30---59580208058.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/96755502726.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/taxipe.pdfIn PDF document text
    • http://18554080.com/userfiles/file/tuwunuripaf.pdfIn PDF document text
    • https://wineart.online/userfiles/file/33615733283.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/1278227594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=malaysian+currency+notesPDF 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_off0000b194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB194 18020 bytes
SHA-256: 8d272fb36b59f3b25d32348456047b3591465e79b28f1789bc982fa3addff299
font_01_sfnt_off0000e085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 10428 bytes
SHA-256: f700977b6e55ec086f2b310e1c70c70161c7e8f7c7976977059ce3a1c76d54fc
font_02_sfnt_off0000f859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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