Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9c5e34b0a5b4c5…

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 11:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d4097962cd3ecf70558fac583efb9a70 SHA-1: 94114742e03179b5a48c45836617d2f5043d2ccc SHA-256: 5b9c5e34b0a5b4c533e2dbe49d67a38425e9bcd59d1af2150cec801a3aa2e414
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=toshiba+studio+3055cse+manual PDF link annotation
    • http://bluecars.pl/userfiles/file/moludovin.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0912696001628847018.pdfIn PDF document text
    • https://digireg.si/upload/nejarutenawekikesopunuji.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100672c2f880---2632979773.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/50745831556.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/9512574481.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/lv8d51oprne7u4p6jku1dstq23/guxufilove.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/rujobozikijilet.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/tgqmqfs1rq3r8rsm8vbb6g8a8s/lasigogazitezipabojiliki.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/69463226836.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/d7nktgatnjuhepu6q13o1q98uu/89323566666.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/901bd10909e5714f6af3e37729be757f/23596672969.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ae48af3d4---siponatixitodutemej.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/095a2b3a9ce6f07e04a85bf3d1730e1e/xosodijikuk.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/zopemodupovisokoge.pdfIn PDF document text
    • http://vtaky.sk/media/file/jejaxepom.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c8270f0f630c32dbdd4bbc4fda2b8943/82330159360.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/fuzimexixarozuvanuji.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/48328044119.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/debapavugam.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/lelelemepesatazafomotaxo.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/zewer.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/93987530334.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_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 17560 bytes
SHA-256: 75ff0d0ba62cbd0bc819fa4b712f829e03ce3678690c6b6e7b5cbb94bd7b36cc
font_01_sfnt_off000113a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A2 11168 bytes
SHA-256: 0cb33eaca17162c6a3a18cd60279128f1c3af56f28ebcd61f8568bcc9dcb5b70
font_02_sfnt_off00012d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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