Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1840dcc3e4f541c…

MALICIOUS

PDF

89.1 KB Created: 2021-06-28 16:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dd94abe108504b2e7269f4d505da52c SHA-1: b19bd011873c9c2e5452529b17b30a0788666af5 SHA-256: d1840dcc3e4f541c29ad79eea770f61828ad2a351e72d7540d0cd98e56d7b483
164 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. It functions as a link farm, presenting multiple URLs that point to compromised WordPress sites, likely to host or redirect to malicious payloads. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic to lure users into downloading content, potentially malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=disobedience+full+movie+free+download
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7bfc57fee---potogupasesekagobevugof.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ef1drucaa9s5t0gbeb0tkr32dr/viposefiposurimezemipi.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2a05a9016---laberuponijo.pdf
    • http://twothirdsmajority.us/clients/38522/File/bezakesetone.pdf
    • http://konemara.hu/userfiles/file/jozanomubonow.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d43b0f30a5e248d5f24f983063115095/34366314009.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e56bad2c6---lubirakidimule.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/02790312ccce02f0a80096c70b2beb8f/64728949748.pdf
    • http://christschoolblr.in/userfiles/file/45613472713.pdf
    • http://aihyang.com/userfiles/file/gagekifa.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/mvak95ramr5a4ebcgrbupvcse5/xepezatirexadotazolu.pdf
    • https://mayxaydungthienlong.com/uploads/files/files/lixagotufiwukawipefil.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/69b0a94d67b06e2616bca3f1903c4f79/pibinesoxuzotunixegevoni.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/dc6997d21ec4978262f7661eacfe4dd1/ruvadodipidodonawad.pdf
    • https://baxsporthorses.com/userfiles/file/68416790517.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/5f0c4f10e6f279366713f674fb2407a4/tebadebijamiverezusunu.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd234564fa2---83841135196.pdf
    • https://myphi.biz/nbloom/fckuploads/file/84221947270.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16090b304a08fe---bidilikiwaduroke.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c85ef6987a1---9694177852.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/7d312acaeb359732998e007d6e29d3f7/75979666076.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/jd3gqrjjdh7nht92ocf7vstak6/93095417160.pdf
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/60532285294.pdf
    • 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_off0000f973.bin
67870c5f86c152146f382ba865906703816c50006209b21754dac678b3b4d68b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 16988 bytes
font_01_sfnt_off000125bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125BB 16792 bytes
font_02_sfnt_off00013dd2.bin
2ab60a8b360b5d9a0fb1fce5fb170d0c5775b300feb2b6828bb05b7b6dab9ff7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD2 10932 bytes

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