Malicious PDF — malware analysis report

Static analysis result for SHA-256 25aafaf9d623c20b…

MALICIOUS

PDF

89.2 KB Created: 2021-09-15 15:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee0142d1b2b3e2de1a06943fad3d3990 SHA-1: 3888de0f2ce7f7cb496a92e2a8a374e31d41ffb1 SHA-256: 25aafaf9d623c20b23392525a120fde44f7677c1c77b22cc84e88b78dcb89ed5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised CMS uploads, suggesting it's designed to lead users to malicious sites. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://smidgel.ru/uplcv?utm_term=idle+property+manager+tycoon+mod+apk PDF link annotation
    • https://kotypsy.pl/ckfinder/userfiles/files/75061283781.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/f2cq8ttd35j6ednsnfnq2rhvn0/38118468936.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/goserixija.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/navukunifewobatalagij.pdfIn PDF document text
    • http://feg.vn/uploads/files/98207311026.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417bc0e0f4d---74502151870.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/jemuwe.pdfIn PDF document text
    • http://aadcnfgl.netsociality.com/upload/files/dixidobeler.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/sipidokusarofiw.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb8fdd2754---87790867103.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-15/210915074200502688moghnie666y2.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/livotaraminalapubavojozul.pdfIn PDF document text
    • https://eurotig.ro/file/kejomasakofajetukematul.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309083d2421---5937044380.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/87758298075.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109030110451050.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/31979369644.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/kugujirinepi.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/mubepede.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/20405148026.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/33404940340.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_off0000f801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF801 18096 bytes
SHA-256: 1f7bc539069008efb29589d4a8e2a1b23a37337c6167a55171ffa8fb93d52ec7
font_01_sfnt_off0001270b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F22 10752 bytes
SHA-256: 1652f7fd99572377273f42c78cccb11fda030ec3d04ac89b51972b5a0fd8944e