Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a38c3a2565aa7b…

MALICIOUS

PDF

111.4 KB Created: 2021-07-06 10:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 44a0d498439ec71b51bf4d4954373836 SHA-1: bf95d0989b141e88f4fe4960668ad3e96cce3cd1 SHA-256: f5a38c3a2565aa7bdc48cdb1ef895f5c6ec0c3e3288e0f7891a5eade9a18325b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the presence of multiple suspicious URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/93f1050b9d3353b3d01b63f9896a8a6a/32156897655.pdf In PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082c582ba39a---zidirebinatabitanike.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e390575f02f---mukarije.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/80af13958398b844df247e16a46f3b2f/10040981622.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/25645827613.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/90c24590c1bdd7db4a7194cbc5f83fa5/59333668457.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5f8824f69---80756805440.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609054291493c---duwonenixezovusovagores.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16071736709621---diviferikezuxob.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/1afd003095367286f994cd0622e244a3/57961441125.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/dewazimirajivezonumuwof.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/78711b05cac4a54ffefaa07b1764be35/57009297452.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/1141858a5d9ac2ca968e25d424c037bb/fabajodigojeseloruse.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e97a2cbf5---97058491439.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/89250743122.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4aa310421c---potixumajizatadipodeg.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/73384009567.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/534098843.pdfIn PDF document text
    • http://sam-global.info/files/file/budifogope.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/xurodav.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160794817672db---zipisenonutigutuxasone.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/1976654835.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf6026bc4---86864327161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=is+and+lm+model+in+macroeconomicsPDF 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_off000153cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BE2 10384 bytes
SHA-256: 9ef58833561e22940cebc8b2370b2bb5b4158f799966ad3cf0bf1ab417abc05a
font_02_sfnt_off0001833c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1833C 17508 bytes
SHA-256: dbdcbc2744cdd8551a4e34bf05353271e41af98813262b81ce2ba85d574fdb3a

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