Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa82200d221a8e0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 03:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1c2ac74d90c591091f8c62c8a6ffa53 SHA-1: 18fe663ffb756c5529d062d09af5631322176df6 SHA-256: 8aa82200d221a8e0dec6f2977612b3c7d99ed9ba9fa5e98fb38e4f3c9ba3e290
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.puhito.hu/uploads/65292880118.pdf In PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613990f85e86f---ragekajidetusifeka.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-05/fa18db0711218af585147d3c55d3f1dd.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/zojebitunesavazod.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/vunebuxuwikokuse.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/50268898675.pdfIn PDF document text
    • http://www.puhito.hu/uploads/fajejadat.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/nefepatovujo.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/zaxajazirijukefoz.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/41959788428.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/6238f38ad95f9a077393ebfa466b582d/99241764766.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/090719282960.pdfIn PDF document text
    • http://enricobarraco.com/files/vuwotiwasavudamoj.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/daluzutirilikazi.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/umri58m3ijvm2kj1nt1f7e6kna/88965428742.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/pewodotit.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/75739842738.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/tivelebojiweludurab.pdfIn PDF document text
    • http://alltechsro.cz/files/82362807615.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/wagifabupekuwodabep.pdfIn PDF document text
    • https://fasleh.net/Files/files/wabifatagufanat.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/butedelunomewukosugad.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/58872828974.pdfIn PDF document text
    • http://hnyinfeng.com/d/files/55213564324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=lady+popular+fashion+arena+mod+apk+unlimited+moneyPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/88768735823.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_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 18516 bytes
SHA-256: 8c97ed8d8ecdaf494c489a4b85446ebbc830e1b234f65deac59387e8acb24364
font_01_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12109 11028 bytes
SHA-256: f4c88fa29ba71ec0d1fd6efded3b923149c7c110e6621bac7bef371b4b8062ac

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