Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90c1cdc84dfcaca…

MALICIOUS

PDF

90.0 KB Created: 2021-07-04 03:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dcf3712de3155285f3c59eecb346b829 SHA-1: 72fc4f21b3abdef8cd6594eb559317f33174dbc6 SHA-256: a90c1cdc84dfcaca52f3070023951a4a613ebf7fa9d3ba9ccf8fddcff0d03408
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and the nature of the heuristics indicate the PDF is likely intended to redirect users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=reticulocytosis+in+iron+deficiency+anemia PDF link annotation
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/duqpgh0g5bqsbm5867hh5iqku3/bizib.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dad0eaa54---64283188530.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/bfe7297b8ad91cbedea94c53a836bd9f/luwavosakoxiratexete.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ec02deb7ee9753276142394bbfe7d8bb/nuxojiki.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/20386080016.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/lisezefirenekev.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/91888327064.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/33539887667.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c2eb6b75cd71e2303d85273d0bc66d7f/5323804854.pdfIn PDF document text
    • http://www.fk-fudosan.net/app/webroot/img/userfiles/files/ronirado.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f8b9693d7d525a16b9eceeb5ec85141c/42085094157.pdfIn PDF document text
    • https://aneri12.cz/res/file/pibapoxazizusividakuka.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/b1i91gjbs2pe2htjsi612mpfuc/77510488405.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/jizodasizedopemirabik.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/65716694559.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/dilisamafepoxujotusigiw.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/sinebuwukunudufigo.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/tijodidazawomoguwajivag.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5adaa9ee---mazozolomisonudonozapa.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8699d87faf4085adfe3c7e111eea14f0/samadojijugorib.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/87034469372.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/b3ee41dcb6daaaf5602595de6c2ff2d7/71534884876.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/36c4b4e5ba3dd2ef1279f9b2b050ce2e/rivozimimuwed.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160965b2248e08---77832980783.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/3elhnuijiikn0e2847j7lq004s/tenol.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 17292 bytes
SHA-256: 4a66a02d521cf14457f6875d7b40f66e6c3dea80967083247cf69743f6a8993a
font_01_sfnt_off0001292b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14142 10896 bytes
SHA-256: 285add6e73b9ee411ec0bd7aedc75674d1520a98a541458708b2af4f6c622d83

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