Malicious PDF — malware analysis report

Static analysis result for SHA-256 318c26f385ea9449…

MALICIOUS

PDF

78.6 KB Created: 2021-09-14 09:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b256a4c7616294d4230afced1351e713 SHA-1: bc1b42e2d2052f0eb4271cec90a7cad7ec61e422 SHA-256: 318c26f385ea94498ad66e9a5953886c9b61247018b19fb9d1fec780e12fb6bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to compromised WordPress upload storage and other external sites, suggesting an attempt to redirect users to malicious or phishing content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9204bbd430e0a279ea015fad4c56dacb/rorusadowazufiwometivida.pdf In PDF document text
    • https://fishuntpesca.it/file/83135267901.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/xusosaresere.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/luvowiku.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/27732117591.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/70991792101.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/27222509565.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e18ada5f1---zizixagamokisigivokamo.pdfIn PDF document text
    • https://krusomying.com/data/file/wikikovisujeze.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/pulokesutodasozavigekog.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/29743021734.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/dutuzazefetorarixifuzixap.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210910112109.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df818d023b---limipobodejariwemakulin.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/zereturufitugetiru.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/80118234d07cdaa0a98cd06864e9868a/69550365762.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/biposukirotewofis.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/8433717597.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/jamezawuzoxusedabodokeg.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/88099374190.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/madezimunavewapegubol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=saad+el+ghamidi+the+holy+quranPDF 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_off0000ca47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e25e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25E 10964 bytes
SHA-256: 2eacc7bfec0a7678853f984504b72cbf5b9cce2ba4597d73966ab71d64e81194
font_02_sfnt_off0000fb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB15 19012 bytes
SHA-256: ff939fb774a2b3d21200bd492765e80beb80a10700db1e5585862fe80071352d

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