Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea24d3f4491d1412…

MALICIOUS

PDF

78.8 KB Created: 2021-10-06 00:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ff42bf5f327c4f36a13eb898a77e107a SHA-1: e754a87163233fa1aaf81922603aedbfe09d14a3 SHA-256: ea24d3f4491d1412ec2db528780bd3ee8fe8fe9f58bacf262c79c50b40e2e704
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://hyundai-dongdo.vn/images/files/najajoxeju.pdf In PDF document text
    • https://angkortaxiservice.com/userfiles/file/perujidax.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/748dvvf2a8gpetvrqm68gd1856/vedugodasemawofikibil.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/zosododoputijuni.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/muwewavadivajekepukire.pdfIn PDF document text
    • https://sanagustin.cl/files/serigag.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/duxeposewugokotof.pdfIn PDF document text
    • https://sambelteri.com/contents/files/varutewajibukoduvin.pdfIn PDF document text
    • http://jfe.hk/userfiles/43470412863.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210903142918.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/liweviwixawoxujixilobiwen.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/17727329140.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202110/file/37040508801.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/58275353597.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/28252237805.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/1166412196.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/gaduvivijuwawomiwetegigi.pdfIn PDF document text
    • http://kite-surf.sk/files/lajumaziguwaravefup.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161599fdc23238---begig.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109202124236389.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/fccce5555d64a74153e1fb43e149660b/wogadafovimi.pdfIn PDF document text
    • http://sushibelovo.ru/files/91983065091.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210911101752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=8th+standard+government+textbookPDF 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_off0000cd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD23 11068 bytes
SHA-256: 480490f00fd6949c90eadf46f8e5bf340d2460a17614c4aead872938110e16ca
font_01_sfnt_off0000e696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 17984 bytes
SHA-256: b463cb633c604e9d613425d6f5c5eea1dc16a37611ed348f81921c646404d0e1