Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f11b2a405b8d606…

MALICIOUS

PDF

84.6 KB Created: 2021-07-07 02:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a2f4be4ecfbb8cc220716149666db14e SHA-1: bdf9a46036948b5d1f3c6b97f04ca8f734cc4f96 SHA-256: 2f11b2a405b8d606affad24a6bcb0b36c77f8e86f107f2180a4edb0b90c7e3e0
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is detected as a phishing trojan by ClamAV. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing or SEO spam campaigns. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3800

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=performance+critique+example PDF link annotation
    • http://gtlitalia.com/userfiles/files/luvezisetavijoninijip.pdfIn PDF document text
    • https://service-panev.com/userfiles/9394548894.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/56463498064.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/busuzujinoremimuruwajil.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/f78e9f5820997db3db46c13187e18efa/zanafazetozelukodub.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/vawubadopefex.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/pefapiwebo.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/41380648264.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a837a88ca83---46812466937.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7934146a---letilisekaxuxazujaluvojos.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/meregomagowozolafokeja.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/nazokevidavurajar.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c26f1dc73d---vadovu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac81d6c269---34502000054.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/kuziserog.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d0df128e02dc78a75d4c616353106a68/86374778154.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8e31f0226e76942b692ebd93aa9b9439/72970851121.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/35608084116.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4a4c68fda---jajoruvufipub.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/pipubaruzanexupigapal.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/wapedakinapudana.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838d068862a---kodiriket.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872787cca73---vafuvopeleraseligu.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/vuxaxadagoxelip.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bd72892e7---49140222064.pdfIn 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_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D8 10824 bytes
SHA-256: 335dedf1efdfca38bed918baf90c4f985f45241f28ae03106f5cc825029c01ed
font_02_sfnt_off00012ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACE 16912 bytes
SHA-256: db5ffcb4b8553d7103ee159811e2f689d84861ffbd435ac0ab5dcf81e18575c8