Malicious PDF — malware analysis report

Static analysis result for SHA-256 812790eb3e528de4…

MALICIOUS

PDF

93.4 KB Created: 2021-07-05 14:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a792c32f4ad25653bd2d5ba7e3dc6b1 SHA-1: f6c94ce7a3210f9751354ffdc0600851abd3b8c7 SHA-256: 812790eb3e528de405ead939acd2f868079011e7116238ce8c8b1311e631ad24
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/jjsjv4fk5063g32g1856bh0vqb/rodixanilufidarujogox.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90a333850---399461905.pdf
    • http://russkiivopros.com/images/FCKeditor/file/nirimufokutewu.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b075890507c---22050456694.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/saparifupavosiwonuxolomum.pdf
    • https://incasur.org/temp//files/lenuzilijubira.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b22ef64f9ee---21807341288.pdf
    • https://fiberglasssupplydepot.com/userfiles/file/84064182948.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7a463e829---54520182949.pdf
    • https://bucatariizidite.ro/printuri-fi/files/26175814790.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1b1245342---zegubitinede.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/3436f0a058c0817b2f40c6ad9ff89d55/39030271722.pdf
    • http://bettynblue.com/upload/fck_img/20210508/file/neroz.pdf
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81212924881.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16088cf9309c4a---45696354396.pdf
    • https://ecohort.info/userfiles/files/wowuperuser.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a95a729f5---83628375560.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc7cd4dfe9---bovelun.pdf
    • https://mobilieroccasion.fr/uploads/file/36531144550.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747b3929f4e---6780757695.pdf
    • https://baxsporthorses.nl/userfiles/file/20867165408.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082f346a451d---6552467608.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=performance+tuning+in+oracle+interview+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010765.bin
aa821a3da4a716954fca90f4dcc473d1404a030ac9ab9a5c2a2e3943b4418e6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 17636 bytes
font_01_sfnt_off000135da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135DA 16792 bytes
font_02_sfnt_off00014df1.bin
ee6f911a14c874d217797b2be41de2229fbbe3a4fe48800eca7a39feaef43c30
pdf-font-stream PDF embedded font (sfnt) at offset 0x14DF1 11216 bytes