Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67e4f96959cecb4…

MALICIOUS

PDF

78.2 KB Created: 2021-09-21 03:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 26677fbe9f63d7b8c41713237a0f97be SHA-1: bfd3de62e3fb69ef59183c27b446ea551742705b SHA-256: f67e4f96959cecb4fed80a239b39e8c9bf65ad2d95ccbf9702af2cb51f453a19
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting an attempt to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21219356028.pdf In PDF document text
    • http://kawana.tech/userfiles/file/kevizigixituduturano.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/45022583121.pdfIn PDF document text
    • http://parafiasadkowice.pl/pliki/wufutukederigurisegek.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/diwole.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/naradodidetaxetus.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/69870393546.pdfIn PDF document text
    • http://kant21.com/userData/board/file/52656232705.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/20336665051.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/91803844754.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/ed094faadaeb34b3eeb4fde59f0f1348/13650452309.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///20685412874.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/3708883838.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/k12j290bu35tu95bob4rf12pfh/60080436795.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/votorinoxezafisiretofud.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/sosazonugujilodimul.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/jikuse.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/60781997205.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/salonixuxodavupadomad.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210905083021459.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba86ad9625---72797361917.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/pomeluxozidusajaposume.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/77537348970.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/20293359675.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d8ed1538229c4b70a8b114312ef2fa42/dijafobakaxegumisewukose.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/fojapilegijevosedub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=kinemaster+app+download+for+pc+no+watermarkPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/ravijurenakuxabigufa.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_off0000cd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9B 10948 bytes
SHA-256: 302ba6e1cc3d250a08b91926ee28c914a8955a18329300abf91b869cbbf428a2
font_01_sfnt_off0000e706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE706 16876 bytes
SHA-256: e61ebd64479ee0804f9bcc965580b753019bbfd458ff7aa109c46bec165c8bde
font_02_sfnt_off000112be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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