Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cdffc4d9a5378d9…

MALICIOUS

PDF

80.4 KB Created: 2021-07-16 07:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 276b45c16a3084eb82b1377b4b6d4337 SHA-1: c5a4ac46a40c651bd0037f33681e6f792c4c2176 SHA-256: 5cdffc4d9a5378d9b1bb2f0e469e4ce9129588713982f2a193fe406ff64ecbcc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure pointing to multiple compromised WordPress sites and a raw IP address, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and URI findings strongly suggest it's designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da043800e4---26607102535.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8ba4dddf8---56692390268.pdf
    • http://mtecommerce.it/public/news/file/nexewedetanopigu.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/tchqieinhehaamacen686rgdku/44892438218.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608201543b351---31373944645.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3b1769f5ad08253ec87a17b8333e512/peporabunitakuzotoxe.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b99abdc2fc---56875437596.pdf
    • https://landatur.com/files/galeria/files/safisejunisikenumo.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e796f4a7f9---86605649317.pdf
    • http://point-grey-1970-grads.com/clients/f/fe/fe7686cf254963525dc0bd811951f15e/File/nibalubekefesadetudalubu.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/57987849886.pdf
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/22942993043.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/8u8d1gk4oc60nc1papaar0i7l4/lejokipukoxofan.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077846b820e6---zurapawenewexokepomutakux.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b2cc9086b---jifabij.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/4ac1955415c9d2c1856b274b8b07b68a/fotojesomopapevud.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094616e70a81---texipuwuriverumusitivurox.pdf
    • https://anandamsanyal.com/userfiles/file/93157242307.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ie7duu4kbdpc74rie896309in2/76198336712.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/mv328stj8hn89il3vuc9f5lpd3/ruretazekigafabegos.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf94f24fe1---miruwitegugomeru.pdf
    • https://condominiovillage.com/userfiles/file/911003401.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e2fe6dd7986712831b56975439c417ee/tegudiwijelukap.pdf
    • https://vandolderskb.com/images/usr/79543987508.pdf
    • http://tksvolga.ru/userfiles/file/11263536927.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cfdfacad8---62516773093.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=3+minute+electric+timer
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf71.bin
466f7684b671938ca5c1bcb0a0ece428f72422eabeca4a0d8c48f378dde8b431		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF71 10116 bytes
font_01_sfnt_off0000e5ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EC 16792 bytes
font_02_sfnt_off0000fdfe.bin
4389579574610a2fab47d7de52b1dbe4d3739afbab7ef5bef57b5754f21fd0cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 16896 bytes
font_03_sfnt_off000129e8.bin
5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129E8 1732 bytes

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