Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c9c3fbc9a5f86c…

MALICIOUS

PDF

99.2 KB Created: 2021-06-28 05:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1635afa2e3b73c981253caf419be104b SHA-1: f42ab54eed3b60ba287e1eb04870c3a94b3499a0 SHA-256: 77c9c3fbc9a5f86cde692298987af01e7652d313970f9169ce17fd176d132f90
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination and potentially distribute malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7e3c87780---xugaritom.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad16f170d5---vofulo.pdf
    • https://akproauto.com/nbloom/fckuploads/file/wexeja.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c807b12c8c---42650709063.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/2c8e45f22723f6b4d15206086d5598b2/11463784413.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0575e1732---91834318254.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f7ed45e061c4e071ce0383009882c2c7/tabixolabikekigolumug.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/gefikasamajabiwe.pdf
    • http://unsersohn.ch/images/file/favozizolemorukixeribaxej.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607addeb969a4---nivedokisoxa.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/0f08b8d1fd7b5c94cfbe40c206cefe6e/fiwonixezologulo.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/6bf58241c8a51852fb2e566ddc5fc3f7/95191197865.pdf
    • http://phantasos.org/userfiles/file/gexoxosugewidi.pdf
    • https://driftwoodcc.com/userfiles/files/15353782116.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cee2daebc7---99696098116.pdf
    • https://stallion-international.com/userfiles/file/rinatizubije.pdf
    • http://bukharaatlanta.com/sites/default/files/file/56462609182.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160954b1ee14ad---lolagisikasekozirilu.pdf
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/d0246cd2aaceb5fd57be2b6d0269f238/gosujunizamagi.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c5f1a526d---nokasikapeb.pdf
    • http://espacioschillout.es/images/admin/file/pigaw.pdf
    • http://files.ibiza-ferien.de/file/jijidexofir.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079fedaae24a---gipomozawokotowofadu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=class+10+science+lesson+1+question+answer
    • http://medlab.webd.pl/upload/file/vokuvekepaxidefek.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010afb.bin
0491ab1f9781984131449868ed95f15036bddabad70a51597ae233fa8bdf08d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFB 16076 bytes
font_01_sfnt_off0001201e.bin
1a29c131c118e85cf69cb5ec9ffe2e3e517e60eed79af46ad859ff5ee64072b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1201E 16828 bytes
font_02_sfnt_off00014bc5.bin
1e2256720f412155e73f6d2f3b7e6585397a0f804654fda5c85762e2069df673		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC5 10760 bytes
font_03_sfnt_off000164c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164C6 16792 bytes

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