Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b42bb03ba7b91c7…

MALICIOUS

PDF

86.5 KB Created: 2021-08-21 08:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ca48a6ee40c873165f9e6bdeba8fbc5e SHA-1: 93e7e8a4b9baafc977c4a6f668c3881d085e2620 SHA-256: 6b42bb03ba7b91c79e4203d7d2623465b1b73eadaa92c29b0e278cacdcc114a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external content, consistent with phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://philabc.ru/uplcv?utm_term=how+to+write+a+30+day+notice+to+vacate+rental+property PDF link annotation
    • http://wadsoda.com/UserFiles/File/xemenu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7311599fa---finuferiboxexezorenotalix.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/04ebfe48078e1f4d32fd33e2db7cf231/karitozazusewirepoxupafi.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/sewema.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/71366930004.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/22776029801.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/36507783272.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/70926816550.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/37844904185.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/27167cbf128b741bab11925c24ce8718/dofukalamoruxajoro.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/0j5gun3fv2g8je0vb9basr6e24/50199650728.pdfIn PDF document text
    • http://consade.com/userfiles/file/40770999265.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/40486761950.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/desesobudib.pdfIn PDF document text
    • http://fotossc.pl/_files/file/89102440764.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64fe460af5---witunegulekesulob.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/58103214341.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f7a605580c2c7676e2913b9362acacc0/59429951670.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/83279947659.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/0a06606f885f31edb4edb70a8ab6d16b/pobud.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/lexotunevo.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1611da7ce59316---78588870131.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/vekitajodapubezojefevovew.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/c7a0938fb0c1b140f4ee4fd09c6998dd/lamiz.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_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 16480 bytes
SHA-256: 1e7308fd255d5181de7a4466a657cda678c6100a6ff97171875676ef999159fe
font_01_sfnt_off00011917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001312e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312E 10888 bytes
SHA-256: 6d29f06c527a07716a3af8c6288a3ccd057568220be599bb6fa8d70aea9d93cb

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