Malicious PDF — malware analysis report

Static analysis result for SHA-256 f849b3462ec5053e…

MALICIOUS

PDF

72.0 KB Created: 2021-09-07 11:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 61d99b1246f940ea9780ef540bc60d62 SHA-1: 37d0d67b207824cc39ced0936e9c9ef69e13591f SHA-256: f849b3462ec5053e70293284868353753d325bee644a775a70c4a2531906b57a
164 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is often used to redirect users to malicious websites. Heuristics indicate the PDF acts as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://drafthe.ru/uplcv?utm_term=def+stan+03-24+pdf PDF link annotation
    • http://valeneighbors.com/userimages/11114543882.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/lupivunalenaweguk.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121768ea403f---bifenumijid.pdfIn PDF document text
    • https://fultoys.com/userfiles/35863948458.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/30430052550.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b2f881a93c14e5a584265045c449316e/busakoxifonemorejiz.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c9bb78fe4---6001507701.pdfIn PDF document text
    • http://uhorder.com/upload/files/tosanademivavoseligiri.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35dde7983b---vonipajugawexotudewig.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/zapojisokubem.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/bomujal.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744a8290a99---viwef.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/32236541771.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/68907555447.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/denenonibewuvo.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/10njueh3k81b546vf0a3iis7kt/dolugufikodawusawolori.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/vobanonewosemif.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93c8265f67---kidawapukapobobanoranuser.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/0b85c44c4b4f0e2866cb1286b182d04a/bofigi.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bbc02135f519ebbd1aeed8a9b1b9a2a9/98176987569.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/karitiba.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_off0000b720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF32 16864 bytes
SHA-256: 64a10b29239fb4f6417e68d4cfb053021705e3ce24bc1f7443cb59e675cc8c08
font_02_sfnt_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 10660 bytes
SHA-256: 0e340d0143a8cc7baf8ea0648abaa975b540e44d67dcb022b753637c0c2e197f

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