Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f62626f70aa14b0…

MALICIOUS

PDF

85.8 KB Created: 2021-06-25 20:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b5c46f74a9c5e65db19efc31f0089946 SHA-1: c0409f24738d5767feb6b92b79ff83d4ab5d448f SHA-256: 7f62626f70aa14b06888bac8cb53b22ad75e969c28bb88a4aa3cc12489f6a4f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are part of a link farm designed to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841626eff75---15960960802.pdf In PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/e74143787bda17c1c74b880ed00dfe89/tegetadun.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5d8acbfb1aeb7bccad62b82e2c05f465/93247508387.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/8a7gacvp4l4j45fga2g3rni3n2/82430352486.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e892b8120f---rawusop.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/zesopoxufepe.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/83553989449.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/7944660718841ad6e1be0c7d29d05413/66329763378.pdfIn PDF document text
    • http://jkohut.pl/file/somiludavubolimazufetuvi.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbc5445cf6---tejikenita.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/36100122656.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d54947b574---52665871789.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/59160a92b08e814c39591c78be5b68f0/31586771346.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/5ba4780dd632e5c9e74eed4eb41a4116/72055590949.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7c734d28747881375658e7db1c319b23/kaworabutas.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/timilivogidafo.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/t4go6if1f2jv3cuv98h5561jb5/98260312972.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/42c1f13585e0010da06b447a86fa8f83/dolididesipidumodepujumup.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/daa17a58080e35249a6a08e39dacfa62/56230089173.pdfIn PDF document text
    • https://unosms.us/userfiles/file/38071683944.pdfIn PDF document text
    • https://robertbah.si/files/file/rapixevusovopuwikar.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/43373105075.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/41540635412.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f4ca8c566c3897f0ab45948812f788ff/21973514293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=interview+questions+for+your+future+bossPDF 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_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 16660 bytes
SHA-256: 6e70734149c9a22b149fdd1d471945e088872d233c9757e6abff51f2107617e3
font_01_sfnt_off00011965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001317c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317C 10600 bytes
SHA-256: 7bd622497f872fb4ccdd0dd7b470a20d3475641495c2458fba234e71b2f56e28