Malicious PDF — malware analysis report

Static analysis result for SHA-256 6165192683a8ebc9…

MALICIOUS

PDF

101.4 KB Created: 2021-07-17 18:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b8a0ded362408cd8c84545c5b870e2db SHA-1: dd37f35ac76be63fb82bbeb98b8f443678b6ce79 SHA-256: 6165192683a8ebc9db491dce08d76a3befde4268d1220e73ff4fc904cb779292
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9711

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://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/riord5dbauamljkpd4omsaj70h/60069382432.pdf In PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/3rp4hq98nvp3vdm9hpeth97tai/pifekutilo.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaea11d5c42---26738077592.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/qj2ru17uno07nhitpvi8g3vgfp/3045408715.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/8d3980b6fdae997fbd10f964159ff53b/kavedolajoleboganuxabux.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/9239386062.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/5e0hklbsmhlm6go10p3e192l09/zukij.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/479cb69051d2678289143fc1ca55ae18/31683022593.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4uj84j5tea5lil2tcbhffbrdg0/70394205500.pdfIn PDF document text
    • http://zuche0551.com/upload/file/bufetotinagolava.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210709112626_760435128.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/birugov.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/ditoxixisufizudeluredomom.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c6889937f91a0858d797e0a2d6e8d2c/tolawomevokafofosofisuged.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1bb7c6431e---37305198534.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/digolimipixetut.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/vikenukukovidu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9d74370ad5b31e91bc376a96ac7e405f/mobunigujovonuzavuloj.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/iq9h3q4dqbba3462jbllth6tg3/65666086883.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/57316380799.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd555e7460d---tukobanodo.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/vidonuvazaxosamidotapa.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66406382248.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078cafa7c384---kafakokibexolomogesaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=maladjusted+child+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013862.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13862 18620 bytes
SHA-256: 59d3c3db937ef0128f88d7f16c5b97ae43b05437d20db75dfab7e0585aa90998
font_00_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 22548 bytes
SHA-256: 6c83a50c225a01d6316e2f449fa5d422dcccb670108e19cca2a9299ecd560893
font_01_sfnt_off00012ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE8 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off000156d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D2 10820 bytes
SHA-256: 29464006a783e54840b5e6fb998de6cc9ab47560cded4af387856ad1cfd60eea
font_04_sfnt_off00016f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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