Malicious PDF — malware analysis report

Static analysis result for SHA-256 54311c97dd02d208…

MALICIOUS

PDF

80.1 KB Created: 2021-06-25 20:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c96537ed556a9968afe8b19606be3a25 SHA-1: 88c95e19e0fc9ca6e006f30f07aaf71c5f098a91 SHA-256: 54311c97dd02d208dea59b601328b222f02a31fb720f94b0d0439cb7a86ba6e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised WordPress uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://premiercontractinginc.com/files/file/lixularuzonub.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/j66hurpo3jueoq2086oo261jpl/liveputofunozodake.pdf
    • http://coeb.eu/userfiles/files/81871761676.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/rv5gt1ordd30pc5g80h9su0jk6/49792627364.pdf
    • https://baongochoa.com/upload/file/28756439376.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/15262822188.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078958e30081---6291213995.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/l27mtbd0ja7h3o9gci5eabo2u0/zisikivudarujo.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6d0cf73b24c605df4dddf2a2a2bb4f39/29567468918.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e076438a3---48223422727.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/80bc9c599d2c9e872fe7633daec50734/koxix.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/6c4759u3q67s54coubprlsmm6l/raxatatemunakobuxud.pdf
    • http://mulherinscampground.com/clients/879992/File/89367640535.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33480723b5---86838135105.pdf
    • http://ricarda-allegra.de/userfiles/file/23910564621.pdf
    • https://elsadaulte.com/ckfinder/userfiles/files/23349555423.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/66f884ea806eb56c0c687a4c468c2563/24255019755.pdf
    • http://ascensionchina.com/userfiles/file/mazozomawuxufefogexuxe.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/k4q5avrp9fc54dtu8pc10tsa9c/vononuvupesozeza.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc5e60a9d---65709800078.pdf
    • http://uekekb.ru/!upload/files/gasawadajovuxibezig.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=multiplying+mixed+fractions+worksheets+with+answers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d325.bin
142bcc29bc6693ab17b468fe42cf3c0b58853ca6084c462ad1e23fd9945deb07
pdf-font-stream PDF embedded font (sfnt) at offset 0xD325 16988 bytes
font_01_sfnt_off0000ffc4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 16792 bytes
font_02_sfnt_off000117db.bin
720e00211cfada5ed93a290cc157fb82b3255780581a8b7fb3ec0972db190f99
pdf-font-stream PDF embedded font (sfnt) at offset 0x117DB 11556 bytes