Malicious PDF — malware analysis report

Static analysis result for SHA-256 db54ef7ce96cc741…

MALICIOUS

PDF

73.5 KB Created: 2021-09-21 13:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aece3c1995d7b5fb220d554b4a1e96b0 SHA-1: 5c59696193b3bdacbef6de55a4bccc71fed3f982 SHA-256: db54ef7ce96cc741caee205a9965c720c2c5589edcd9ca256b048e2b08e0a35d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to potential exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synodradomski.pl/userfiles/file/fafetasogimok.pdf In PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/lusudofelofele.pdfIn PDF document text
    • https://5udua.com/contents/files/43140259990.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/jevopepoxovalekadazuput.pdfIn PDF document text
    • http://zuche0551.com/upload/file/witufatowasuxofimusud.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139175cad3e9---13762476010.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/bisebiwis.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/xefemusuwogutotiwemijat.pdfIn PDF document text
    • https://buyafranchise.org/files/files/24666804542.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/84571259850.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/0d97ec2416d11b656c9ac04d833a114f/85645938293.pdfIn PDF document text
    • http://letdentalab.com/img/files/zokoretemojifetuki.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/koteketinetalugij.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/95187170621.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/simulapajejijomaki.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/5c7703fcac0c482fea576177569197fc/gepavugox.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/35071039812.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/zijazu.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2a8a3d6a4817e991ce85e5325e107109/29253026683.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109120918408606.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb5daf46b---60906437389.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/pubevisar.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/wivipivagodururirumibap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=free+facebook+messenger+spy+androidPDF 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_off0000be70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE70 15968 bytes
SHA-256: 6e56b17a0409afb1fab433645bb9b0ac6fa1ee344acdd103f94b00f4af392477
font_01_sfnt_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 11140 bytes
SHA-256: fc7c80c4937f352f47d0f718cbe5955e3dc4c7ebbb541b22b7522a27b9b64219
font_02_sfnt_off000100b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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