Malicious PDF — malware analysis report

Static analysis result for SHA-256 849d22169d6e6048…

MALICIOUS

PDF

71.3 KB Created: 2021-09-05 23:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc82806b1de0dd6b5f84f31175a27df1 SHA-1: 2268037081fc48055c214500054b85420d81d2a9 SHA-256: 849d22169d6e6048d4190a38b6925d89376bc5bf78621fdf737ad2d9d557fd0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the conclusion that this is a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/bbdc32d053dae53d42f0cd80ea17a7dd/koxus.pdf In PDF document text
    • http://dakmet.pl/upload/madevonomaxafiketifufexud.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/00e17d8a19bd3ed7ef36fffb466d9654/10467360475.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/tewajeri.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/70751357273.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/97064213636.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9dda7b10fc---nawesanitajesino.pdfIn PDF document text
    • https://agatanorek.com/files/file/37235744912.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/48053980507.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888201c63d2---89381724910.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/bugixudelezatemivotere.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/44252849121.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/vokuxowelafi.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fbac0a6ef---zakibuzi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5ab8965d01944f3ac8e82626a73a98b2/15697940089.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077194ee5921---kuwovigomulo.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/merowevurik.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e642b3188de---15914695346.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd28adadb2---50317364772.pdfIn PDF document text
    • https://ultralloy.net/upload/files/vulafa.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/43406292308.pdfIn PDF document text
    • https://afayl.com/userfiles/file/fosal.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/gofudagojawibomitiwop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=arbitration+and+contract+law+pdfPDF 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_off0000b748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB748 15864 bytes
SHA-256: 78ce2643f2d292c329f9cd0984c437c1fd47b324aef6bba6960308ecf4382042
font_01_sfnt_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 10520 bytes
SHA-256: eaa8ebce1caca6f3834f09ed969b9f47521328d1f3035532b9baca5621c02f83
font_02_sfnt_off0000f7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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