Malicious PDF — malware analysis report

Static analysis result for SHA-256 d346f86d110286bc…

MALICIOUS

PDF

72.8 KB Created: 2021-09-17 14:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 82dce9a28bdc5ad7c7de0a7bb2436bf1 SHA-1: 0beb015caf19574354724841a60852fae2e0eca2 SHA-256: d346f86d110286bcf799626ee7a6a420e6d65143088b370b3f16c25faf7749c2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm. The document body is heavily obfuscated and likely contains further malicious links or redirects, contributing to its role as a lure for malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://krisoc.ru/uplcv?utm_term=titanic+adventure+out+of+time+android PDF link annotation
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/9nl7e4is192ffjocvdbo6j8a2k/riwakojovevemenafonodaro.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/modaxipuxevibosuvow.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/kujabaxemasikivivozin.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210908072226.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210909095915.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/80045904521.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/dusanufosagipelusimas.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/50846034166.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/kexuboxadebupo.pdfIn PDF document text
    • http://pk.mo/userfiles/file/sofevedatuzopotametomudip.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ad70393d53ab20ebf4234a6fe97b3a33/44039299446.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb74b51298---22145689859.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/84867550212.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/sazudenajupoderikon.pdfIn PDF document text
    • https://penal-garazh.ru/files/gepukagexasipiguje.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/silafi.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/nomuliferaxoxem.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/ridoluxemefawomonisimilup.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/lixavazazugi.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/0vjkeh3blmvabra4lufkt4pdd6/jaxajut.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/loronoga.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/duxasojaresakilutemam.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/52147466721.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/diginasidux.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/41387541633.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_off0000ba78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA78 10552 bytes
SHA-256: d64e30fc0eb3268f2cd5d9957b0f7042611a96df10264acfaf203ce848febaa0
font_01_sfnt_off0000d291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD291 16636 bytes
SHA-256: 138be32f3e4ce5425b69624c44914609a8eed667640817a154f77babb0ad9b8f
font_02_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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