Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f4a2b43bf2a23b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-09 02:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de66f58edddd5ca046aa2e5428ef27db SHA-1: eb5f64f985fff3b9fbdcb07a8482207411d5c46a SHA-256: 83f4a2b43bf2a23bd861c2e0584365b22c42e824e3c665527d2d6982c32d8f02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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://mazraeir.com/images/upload/files/59241706892.pdf In PDF document text
    • https://fertilizergranulatorprice.com/d/files/1019161393.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/4741970108.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/pifizuvafikotuse.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/74229108837.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/70310750772.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/6772734370.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210901180834.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/92658864334.pdfIn PDF document text
    • http://elitvorota.ru/f/file/topamebetul.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/jatowijorub.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/f004a9ff852c31b90c44bfc254484489/rigegodirovojagateven.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/23935833676.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/68904102085.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/88600179040.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134db7b53b71---fivotararonenazod.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/60707103117.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/xuxevatusetivenapezimetes.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/govuboxoxiwif.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210905111147.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/nudivawituvaful.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/384587846.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/428ede99aaf961179abec03660180dba/96366097334.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130b07c4f0e4---sajerilalixebajuxojodatep.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/nokag.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363f021d71b---radezite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=coby+kyros+mid7012+firmwarePDF 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_off0000e347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 17864 bytes
SHA-256: 996c4d7623b86536c6f87e36e6dd2fba266736215a95222b8add338144c5a920
font_01_sfnt_off000111b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D0 11076 bytes
SHA-256: b74dda12e0a04d53f1094f80b112f2710d86313a4d2ffa1f5eedfa9fe9e795bf

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