Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe86ca5428739751…

MALICIOUS

PDF

89.4 KB Created: 2021-07-02 21:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 128098705ceb39e580a89f32c8259c20 SHA-1: 443c83faff3a2b930454c5113c57bb8d436ad5a7 SHA-256: fe86ca5428739751146e5e3f3af3a8f899dad275a7a88654ecce874f3f7f2abe
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content or for SEO manipulation. The numerous extracted URLs, many hosted on compromised or suspicious domains, reinforce this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://andrejc.si/files/file/tiviranonivepijiperug.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fb251e81c---52501131396.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/26f0c1bf55f51001cc664187a8f80501/96531628502.pdf
    • http://kasaitogo.com/uploads/files/51813753790.pdf
    • http://ddgasul.com/userfiles/file/96953774035.pdf
    • http://aligokdemir.com/resimler/files/43721282807.pdf
    • https://vmwarts.com/ecovic/file/suwojatize.pdf
    • http://maynenkhiinverter.com/media/ftp/file/tegonosimifilanebasoju.pdf
    • https://ventadeterrenosurbanos.com/userfiles/file/duvojal.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b96791fd2c---xopugarik.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a34fe27336---rarazamikefamiwul.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/d9d233f8a1702ce7eaf919004a4871b4/23987863753.pdf
    • http://geose.ru/userfiles/file/15692073276.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/76e34abf0cf2a54a4aaf3d5aa7ea546a/daloxomawijepukikuzeko.pdf
    • http://gayaarchi.com/userfiles/file/20210615050724.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082831d61fea---momofevagawusa.pdf
    • http://allmedicus.com/userfiles/file/32140257275.pdf
    • http://cana.vn/uploads/userfiles/file/giwutofatedofusu.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/95c9e7f74d0fecc54aff6a874577d4b2/xodaxot.pdf
    • https://patc.fr/imagesfile/38722937830.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/7dadfbd42f36c8e8866bafe2716e2507/gulife.pdf
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/1baf71f5d8398fc114d7a7ab1d256b70/12955282092.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16207904608113.pdf
    • http://oreade-breche.fr/userfiles/file/disizapebesikejiw.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=an+age+of+adaline
    • 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_off0000fb8a.bin
a3fc3c8bc366de79e981311e00099c9c33006d28fe188866c072569a8eba7e48
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 17956 bytes
font_01_sfnt_off00012a1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1C 16792 bytes
font_02_sfnt_off00014233.bin
8b6ed77f036039bb4e238bdf3b710de54a4961831d0258bafb5ad08745e2dd77
pdf-font-stream PDF embedded font (sfnt) at offset 0x14233 10144 bytes