Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e81c176572a551…

MALICIOUS

PDF

101.6 KB Created: 2021-06-25 17:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ef199ecc774a40554620f3fda4efe28 SHA-1: fa868e8553243fe42380688c2e3034e0a3c70093 SHA-256: 45e81c176572a551ecb3084c7d469196f1b95321d065e1fb577addc29dc0c2a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the detection results point towards a malicious PDF designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9767

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://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jesatq10vs1jcgs8gcmuvljdpr/rukezujixolorumidatus.pdf
    • http://zonazero.es/userfiles/file/dejixasoxuxi.pdf
    • http://seamcc.com/UserFiles/files/80020117112.pdf
    • https://loctra.net/userfiles/file/kamidatunagijili.pdf
    • http://mea-travel.pl/userfiles/file/noxedatolekenolak.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/43133bec1afbccaeec6f0831bd5b5777/7880640094.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a02061f13---budegoxitufedunituxi.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/kokofofitivejogo.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5ca450d54b3e0613419a854b25fa3819/68016957182.pdf
    • http://charivne.info/images/file/likanek.pdf
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/41135274772.pdf
    • http://fresh-j.info/images/uploadedimages/file/29571403135.pdf
    • https://autoprofi.ua/userfiles/file/59694856139.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094d339ecbdc---90116566713.pdf
    • http://banghetretunhien.com/media/ftp/file/92547892932.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/cdf76eb5157fcd41b1a34571c4a89086/legusowakik.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9328dfafd---vomodumafojituzaw.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/40b063e599e34e580d4bf040806fc4b6/rebemul.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e37977db1---94586551293.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/h0ue76rtgtfqnmrk0q0ci1flk3/pefaradivinopudabawetokil.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/43837863228.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/eb87f65f39d9832586ea4a617cca5299/63039733187.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aef4a1c7e89---70831897747.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ig1fdq9fgqr9hg2phg7a4b3e8i/difurafesujerawozizem.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16088e207869a4---kutifusitututevifemufo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=chape+english+meaning
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00012d93.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12D93 18328 bytes
font_00_sfnt_off0000f135.bin
793fee64ccacb670ad03917fa1392c5094f86d43952a151c79973d5c39e37ef2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 24684 bytes
font_02_sfnt_off00014b34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B34 16792 bytes
font_03_sfnt_off00016341.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x16341 3464 bytes
font_04_sfnt_off000170c1.bin
73427313eb6a22863bae897bf505679bc780e98d36df3f2d8cdfbe06c9cee1a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x170C1 10412 bytes