Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a00614e89d3dd2…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 15:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a49921403b84db2a1920868f19aad417 SHA-1: 35bf093afdcbc7d469ef2324ba26f500da1a17f8 SHA-256: e6a00614e89d3dd26afc69bc3b78e37a8f13091532f8de106932cbc3077e7fa8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting domains. The primary purpose appears to be redirecting users to external content, likely for malicious purposes such as credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://vetcasatenovo.it/userfiles/files/86358691693.pdf In PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/77415907966.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/mifoseta.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/9056f7c443140c3d80d83674389c24ae/60915857756.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9c4bb7be7---74506161532.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/83540212324.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/11255315468.pdfIn PDF document text
    • http://3asoft.vn/img/files/47874894683.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/9302966328.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/19019703452.pdfIn PDF document text
    • https://davaocarrental.com/images/file/21501921871.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/jejazimewosixuwomeniko.pdfIn PDF document text
    • https://noventa.cz/media/files/file/pofijaxixozavoti.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210902085000.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/40251609038.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/rulopinogevanizamofepove.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/vakiguvitukape.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/dakoxanez.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/putusupisabete.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614194b19b6f8---fupexorubenixemixerut.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/42133801518.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/dovujogigupakawezufelo.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/dawaguzonadale.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/8960786800.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/97704924115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gta+san+andreas+game+file+download+for+ppssppPDF link annotation
    • 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_off0000d9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 18528 bytes
SHA-256: 5b6f808d17b60a9a342e221d162db5d0d33693214934f91cffc552cc74d408d0
font_02_sfnt_off00012188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12188 10968 bytes
SHA-256: 383c0ff262a36eecf95f37779c164dba208900c76b2898bdf1e016f7f598e1ac