Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fccd16d465fa985…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 17:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f219c764bfe7123d639ed712f01f1a76 SHA-1: c2fd9678a8f08e2c62567478b71c716dcb2f6b6e SHA-256: 4fccd16d465fa98586457dd70ec9d0d1ec865a3adecacbf8c0e514608f391953
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or exploit kits. The presence of multiple external URIs and link farm characteristics indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://evpersoneli.net/ev-personeli/file/19862260351.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/p7phkbtnflj5ulvgul1bevmgqu/30608743779.pdf
    • http://metrocars.london/survey/userfiles/files/18922512292.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/74def4e02e38c5b671f28a177a70bf2f/42872780567.pdf
    • http://daglichtfilters.nl/ckfinder/userfiles/files/73323927704.pdf
    • https://seikico.net/img-tym/files/xusenozijozeluloritonaja.pdf
    • http://adaviestransportltd.com/userfiles/file/dufonukapasob.pdf
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/dafifixuzefazoni.pdf
    • http://simoncaulkin.com/images/fafudadatibakanimikoz.pdf
    • http://driver-jazda.pl/upload/file/tusixegupunadizipezonebe.pdf
    • https://condicionamentofisico.com/arquivos/file/68590854345.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b752ed90f04---gowititugemivemuwataseko.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/fa9e0dc34e6eac9f13c6e8a6228a5ca0/zedafikelevesevikosax.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e95c106b0ba---tipapabor.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613091cc25068---26033493820.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/0loqh3n2mlhs6usleqb26oc65l/dimomelafawimubi.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607685a4621a0---puferu.pdf
    • http://krakowska98.com/zdjecia/fck/file/58808879325.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d00a6c80a---46382900730.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8bd7fc31---senubonosisemup.pdf
    • https://pastravariaizvoarelebratiei.ro/images/file/95089195239.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/c3d70a60f385beb546ecde867ed40879/53041791081.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c7a313a28---81080026256.pdf
    • http://limeitec.com/upfiles/editor/files/34695032909.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2krq3v4q2u1amv1r58dap29v6b/33840080066.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e90256dc9---70241335711.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=social+studies+reading+comprehension+worksheets+2nd+grade
    • 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_off0000e0b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 16792 bytes
font_01_sfnt_off0000f8cc.bin
fe7b1588ad5e71646aeb2ac575e0cbcb9f374b3aca10d13ef9eca6a9faaa5963
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 11436 bytes
font_02_sfnt_off00011374.bin
085d42317db47b13f3b950c0a6b75661028da5376a05faf0b3e7f98060fddafe
pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 17832 bytes