Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9f3393bd55b358…

MALICIOUS

PDF

77.3 KB Created: 2021-09-13 14:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d6b53b07d81d4a71c7d07d1b17f0806c SHA-1: f7571ed80adc092e0bfaec7d83107d0a98ba6fb8 SHA-256: 1d9f3393bd55b3581f029304c081a6d5d72743a2c6041b1be0ea9bd78f933064
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The file also includes numerous external URIs, many of which point to potentially compromised WordPress sites, suggesting a link farm or distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc2956167---pevimikupumugoxoju.pdf In PDF document text
    • http://www.lalorraineperdue.com/documents/55728609293.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/buxuluvukijumupareluwumal.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a4497321c---ritifatomuwimidebewepo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161341e92aeca6---6952224257.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/tatadavixexiwudumapufo.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/85550913788.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f9ad8f119b47488f285f881bba501c71/fesuvufimodibivadake.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/pizawefugenirexivixesi.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/sikajewofizitot.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/41868178706.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/wevitisojepesatirowikiwa.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/goxabinoduz.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/narababixexajorog.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/u1ofd2npk8p817cn91dmilel55/54424573868.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/80476273763.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/51264007623.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/jasorujujoregex.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/rirufivuxinani.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/p1eibohm7882of816ndeonikj5/64901783311.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090211514573499.pdfIn PDF document text
    • https://shevian.com/images/file/49082544732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=zombie+gunship+survival+hacked+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA7 11224 bytes
SHA-256: a060d1bb8cc2a597d82c4029df6e5f499b61aeeede9ad5f229d18a536cbeb31c
font_01_sfnt_off0000d955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD955 17360 bytes
SHA-256: 608f069a4ddf9c4c669776e793978a2d8f8389c9048e6680f6bed8aeeac80fc4
font_02_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E57 1948 bytes
SHA-256: b033f7fcbcd390b2cb396fbb5f03ef01f7ca9afc151f9d9df21604321f961cfa

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