Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb2dc44c52f4a7e…

MALICIOUS

PDF

86.1 KB Created: 2021-08-28 18:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d63e8d56df88ae6c30dacb8a1766ddf6 SHA-1: b3d6ecc38d8bea5316d395a90fb9653b5619726f SHA-256: 7bb2dc44c52f4a7e9e9e292b0106863e0fcbf90b48f5f3f8f97462dab993c93d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the presence of multiple external links suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://laclonghotel.vn/upload/files/finikefedi.pdf In PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/9ae09e160732d476cf06e9ddc14ae123/bunatuz.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/faxokerixinibedadareruzuj.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/9378621141.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5a1f2f8778b4dd4d47a2b21b170f3801/funulabamifokugom.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/lugikuputenoworejizudada.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/gunudaxutabebew.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/finatidujifafobonabezawut.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/29299684107.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210731112713.pdfIn PDF document text
    • https://badoza.net/userfiles/file/vibetazer.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/lojalimepas.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/rinufuvoxewetaza.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/63631092868.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160781c5174bbc---13734804276.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c71815383a4---12424473143.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/88054148397.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/85559216623.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/97088809442.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/mm04het8ogtetcd7111ovkovj5/jelovudawimijifogije.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607b563db90f5---2983249676.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/sesn0ti2qhqijp9bo48orutdq1/ramezixerakozokazen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=baby+dropped+at+34+weeks+is+labor+nearPDF 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_off0000e96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 11120 bytes
SHA-256: 613a2077708aef76af6f0471236e0b9bc39aee6c6732189bd992c189bdc11d6c
font_01_sfnt_off00010369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7B 18120 bytes
SHA-256: 38652d9a22c9668b1e5cad4bc8abdab1df3c362c05c7a166ded89b6aa896fbbc

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