Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f06ebc302522ac0…

MALICIOUS

PDF

94.5 KB Created: 2021-09-15 23:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38f97edf7f463201fd15e584f86fb90e SHA-1: 8bc3ec1bec21b8a521cf188b2aa9ea53697c50d9 SHA-256: 3f06ebc302522ac038617d57df4ea454bb0c4cf05c0e3403a4a6380ae34e37c5
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is a link farm and a browser extension installation lure. The document's content, though heavily obfuscated, suggests a social engineering attempt to trick the user into installing a malicious component. The presence of multiple external URLs, some hosted on compromised CMS platforms, further supports a malicious intent to redirect users to malicious sites or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://columb-sklep.pl/userfiles/file/jogiwubefafeturevotina.pdf In PDF document text
    • http://chipgene.com/image/files/20210901_191924.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/mufuxemufum.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/lopojevenisi.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091120303373499.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/ninubixarosesusorajuk.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/wizomexigu.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/wugonizubufudid.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/4012642856.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/69870393546.pdfIn PDF document text
    • http://elpijisystem.com/file/31424820944.pdfIn PDF document text
    • https://ijpdua.com/contents/files/83114389117.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/koguzizibijosud.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/josoxuburivizaraxugun.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/4bf765384a179ebbf6553a262413ca55/zofoxilojujuraze.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/44432379470.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/15986243552.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/16133290999.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/fb8d670ecd68a096371b4983fce5633c/60321352552.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/wafikepifa.pdfIn PDF document text
    • https://frisch.ro/files/file/bipataxudiwonuxusa.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/60947939265.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329e0fdf688---poxupekezow.pdfIn PDF document text
    • https://htchninc.com/d/files/jipuduvuxizatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+move+data+from+android+to+iphone+11PDF 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_off00010804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 19748 bytes
SHA-256: 4520b67be90c9f09ac320bd931453cee8c41acc1ced9202e8c1a53d4dc2aac88
font_01_sfnt_off00013b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15385 10744 bytes
SHA-256: 26db6caeb6d5d991611ae576c7b72417118295b09722b7fed0b6faab55547987

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