Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc6007ecbe8bfa9…

MALICIOUS

PDF

77.1 KB Created: 2021-09-02 00:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 124b15a24229c642a6f60283d7cf2e2f SHA-1: 38805cfc4c69dd9df846454904ac82a9fab4bf82 SHA-256: 5dc6007ecbe8bfa92206025df07f7faab55f8d3f6d5e6a847ada94aef420ff6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URLs, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=ponderosa+bar+and+grill PDF link annotation
    • http://aircond.md/upload_fck/file/14255793222.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/ruzoforelubituxipov.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/63719017381.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb78851c43---sowemikiduxaka.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/67912062676.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/15562681800.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/povupapotumuvoderuxujikov.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/949aab94772a45387cfea0c4f8995f44/risenaxapivepanen.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/0fded831ded33cf9a3b6aa896e119bf4/xozizarawuves.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/kogan.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/gopex.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/4491826068.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/digujpmbu8n72lcb4lr13rte3g/17533712586.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c79bf920bb049b39a2d164962c644caf/39824530609.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161293b24433ea---gevemupiriku.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/lapepe.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/22136766545.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b435a88022e---25060281260.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/4rrov6nfdj2dgf0jv3p2g5ts23/makudiwaso.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c689f822a9db9a692531adf0ad4df22/9886114293.pdfIn PDF document text
    • http://esistore.be/userfiles/file/23683369846.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/64723036027.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/db07184f8e6dfd5ab5754aeaeafd7a88/85351432099.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/cf0ec99450862f4123b5f9767c33fa7e/42881547302.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/ramovusesomevomubo.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_off0000cacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 16632 bytes
SHA-256: 3a733bf38c3cdb9c6c8048d786bb514ef00b3a15556cf5f47ad323d18fc20493
font_02_sfnt_off00010e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E63 10468 bytes
SHA-256: d5f43e5157616f2b52a06d3c4c05023a567ce60b564b2d9546c7057566f36beb

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