Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7fc5b95d4fdbf4…

MALICIOUS

PDF

88.6 KB Created: 2021-07-21 15:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3deadca921449af8d024fc777c624f2e SHA-1: d4a1dee3a6a140e08935b18076d74fbb41abadbb SHA-256: 0a7fc5b95d4fdbf47f04cb50ff62edbb1781ec4935eb9b4d0ac10f83dd2530a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/43777953188f8e9994bb871b091b70e8/detuwepipedesurotalo.pdf In PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/4efbaa6691349d8800ddc2c808e51c65/62059015012.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b2d4b1481---742015826.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/magojelusizenado.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/31729232353.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b2fecd48d---susatojutuviforupig.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/juwiponinobaneridifugo.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a362ea746b1---jupixemuwegol.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/xinagovorip.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b14fdcf30---95158792128.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/36745633258.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/20803133731.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/1b6037703e5aa0209fe2ac1227121b5d/10790403203.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077a63200804---xogizexuridilejufapi.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/37679460194.pdfIn PDF document text
    • https://t2sc.me/userfiles/wejevonefitenibekojiva.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/zejupilumapafubexasafi.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/75434ef7f4f434e40466c85024e82e7a/fomag.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/55524829591.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-11/20210611112544563342.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/kud3ctemuhg6r29qha7sfcargv/65082153741.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/nojebanosukaw.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/68423542425.pdfIn PDF document text
    • http://absigorta.com/E/file/kupiradijewor.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/amkovj6undumffm5m52a10bll8/xuzenemolovanudezedesu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=verbs+that+go+with+etre+in+passe+composePDF 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_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001099f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 10972 bytes
SHA-256: 25da003f2a74b9a57367a59d6695411c1dc8d8918c3b930af47bd74e5b19cb30
font_02_sfnt_off000122c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C8 18784 bytes
SHA-256: 2ee346c506d44e600030a4af68d26b0422bc47ae224422058b41b94fc3474bd1

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