Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9641abcfa63ee6…

MALICIOUS

PDF

86.2 KB Created: 2021-09-10 12:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6cd6bddf1b099f938da61cbf5b846309 SHA-1: 76c62fcf14ee7c158df9a5117711e6a4d308e0f0 SHA-256: 5e9641abcfa63ee6c8be6199f6657afa60fe551155b78e3b76e0105103bd2521
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content or download further payloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://grootformaatspandoeken.nl/userfiles/file/3593440557.pdf In PDF document text
    • http://lehnerkom.de/images/uploaded/file/11223650611.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/85700363591.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/82574525403.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9a660c7a1---26040533198.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16134477154e5c---81990644816.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/95269439898.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613862f9b789c---88021885536.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/reduvizabibavadigefifagas.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/63175397825.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/totabolawetolagaga.pdfIn PDF document text
    • http://metallpress.ru/files/46319927341.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/98230401187.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/68129717704.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/34557224751.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/87052406677.pdfIn PDF document text
    • http://calisnt.com/uploads/files/fubep.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/pezagoxe.pdfIn PDF document text
    • https://tierlistei.ch/downloads/96867767898.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/8mebd5oajcf2m86lb6pku7pae4/gekaf.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371379ee9e4---bijedikabezij.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/fasevelobixenijonof.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/bekibobukotuxinazajesexo.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/69817768686.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/75967587114.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/69882986823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=highly+compressed+pc+games+for+windows+10+64+bitPDF 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_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 18748 bytes
SHA-256: 9035a8151c065eb092aa8432fde4132b39ce6bb1fb80c25d958dbf99a83b1164
font_01_sfnt_off0001172e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172E 11820 bytes
SHA-256: 1be9470d57c566abcc6cfeb85ede67f0cec5f05d996324252725a2df519a0600
font_02_sfnt_off000132f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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