Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1678fe3af6d777…

MALICIOUS

PDF

147.4 KB Created: 2021-06-17 06:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d3b080e0a30e4972dcc05d104e1c41b9 SHA-1: c2f79e079d164eecfeaa27273bbe76bc88de4462 SHA-256: bc1678fe3af6d7779be73ca6a46f5adbcc74ced25bccda6694fe4024e4ac3cdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=paramount+volume+1+pdf PDF link annotation
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256b48848c---weketupimawujosusomiju.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7ddba6f60a5ca2b5e794b1c81dc1ed87/lidijozidororikoweje.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/993fb56b702c03466de63c5aa502a4eb/58445344826.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb162916f5---lugifajot.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/miginufum.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/h1jbjp9dk3ec2j74haer1rugmc/8942128473.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/xexejumavosajubu.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/pesiridonibizotur.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7dae903c0---67844490925.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70cbb7deab---kasasuvag.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bapesulumagemapedagiwobus.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5841d589d37e37e0fc688ecf35fdb898/6352637713.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b25890dec93---97105383594.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3f8d50c9e---69356769722.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/an9a9ntt0nehtiuif04ko8hi71/kisebokeni.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160755ae29cb2c---gurusonagubuligigifozet.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210529055713_1629147414.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b0bfc1a6e---81219200851.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/k8951v8rdcajn9c92lsem6deq0/65640975931.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/dbc25dd34886a7a16e8e9dd10ccbe8b2/36271661139.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB5C 3064 bytes
SHA-256: 099e982d90f20ca8fe310fb933e237968607bf6ff695636ba20fb4a1c08d0694
font_01_sfnt_off0001c642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C642 5120 bytes
SHA-256: 14fada9e6298c596f0fdb4ed5263461f84668f9644d79ff8adfb475efd74b052
font_02_sfnt_off0001d7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7A4 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_03_sfnt_off0001e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E306 11444 bytes
SHA-256: 9c67d15fc481d720a24dc05dc8f4192e881eef36c2dac16d9692ddbe65527cfc
font_04_sfnt_off00020a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A35 17548 bytes
SHA-256: 19baedcba6339b7b6a7541cdd1ccb17fec615aff61ba502f20e81f92fbc9fa05
font_05_sfnt_off000224b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x224B2 7656 bytes
SHA-256: 2c5c057cb9e0fe1ab8e016cc21c1c7e0443a62307839008c31fa1b0d30f74822

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