Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee318fecb38ea70…

MALICIOUS

PDF

91.4 KB Created: 2021-09-08 12:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 56ea4e3d9508dd37abeb18557ff6d85b SHA-1: 5e89e17cd8bbf633d03261dac5007c26f4b8d867 SHA-256: 6ee318fecb38ea703743092c24b0c4ba0f78045409b3b2d3b8bee9ad20bc4b1d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://huntic.ru/uplcv?utm_term=aqa+a+level+sociology+book+two+pdf+free PDF link annotation
    • https://aneri12.cz/res/file/kiwebukobudiduzinobora.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/wovakowadepegibojat.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/resupulokak.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/l8bvsec8okjh9mckv5a3m3ednb/85275810520.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/kodalubovixoxujefikem.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/37534532347.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/psi5p5rbs8tt4mi42om6c5go86/tiperamexuzememo.pdfIn PDF document text
    • http://hornets88.com/clients/56662/File/64335285043.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078495b5d859---13965573749.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/30353850161.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d70ee21161---nebodasafodebawavanozabiv.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/tuzukenimulagivozuweluzor.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/28134802680.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/48530533377.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b84b6640741---salan.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/pavuwokiriro.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/bovebuxotunizoxagun.pdfIn PDF document text
    • http://cochu.net/resimler/files/xogavosadolixubuxol.pdfIn PDF document text
    • https://altaspin.com/calisma2/files/uploads/50437098119.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/0160b04ed3b749538f2258db7d2bf5a2/kadajij.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/22969105e967d531f604b2e4cf164125/watulikirufetesapunaze.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c051fb2b64c---xujigeresotejizugozi.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_off0000fd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 18496 bytes
SHA-256: 1d74486ab564fcdf8811d2fa194f3db4a9a4957580db5e65512a4efaa0e8ea41
font_01_sfnt_off00012d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D60 11316 bytes
SHA-256: b8e2fd0fbac49574878330d50e01504d995dfe90f0c62937768cfa72811b3c12
font_02_sfnt_off00014784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1