Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21aff634789ebe1…

MALICIOUS

PDF

114.0 KB Created: 2021-06-15 16:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: cb7f5295d808b80558fc187001177a3e SHA-1: bdbd47d0fb5c672fe3d6d4a0a00bfca4913afaeb SHA-256: e21aff634789ebe1ad20cf1800b0b64a1bcdd3059add10aee11e6c2c875b5f4e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress installations. The presence of numerous URLs, including one pointing to 'crewmak.ru' with a 'utm_term' parameter, suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crewmak.ru/uplcv?utm_term=139+manga+attack+on+titan PDF link annotation
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad8ced6511---ratup.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5044b78022fae41d348d5f3cdd2eae38/92653158685.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e04272e6b---83066820402.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0ah01c5db5hqvqf65htkutubp1/taridafo.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/jqi8gtoc61nkioj0fc9m299ie5/lojudu.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607832587d16f---87497579632.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737beb9c966---butunesawekupedafaxidika.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e83c217174---36361060908.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/poloda.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/berelalowulosivip.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/mvonenng1pi127g23anjnpeqo2/zipuxutirugulofujedibupew.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/69436386298.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747cc836bcc---gakolafufaxozetiko.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/04rmo3f5dm1re74rg4i7qep1he/19661880440.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083b2b19844a---tomobovox.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5c256f4f---pesobowu.pdfIn PDF document text
    • https://kildevangen.dk/files/58957421655.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 36876 bytes
SHA-256: 33d220b18fb3dd14f8f55302053686537a81622eb3e1130a6cde2ae6b7d0f8f2
font_01_sfnt_off000160ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160BA 4824 bytes
SHA-256: 3077e207377196216c289aafeee6a4c8b1a66fd7786e0327e779e865aea14712
font_02_sfnt_off00017102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17102 11004 bytes
SHA-256: 3a75d16415fa3b0616ed337893ea70aad857b02aea3d5837adbcce8fb1be775b
font_03_sfnt_off000196c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196C9 16208 bytes
SHA-256: c9f873bdbda2bd46fcf0f46483d5d6f782d8ca6ab34fe0eb1ccbca427ebb433a
font_04_sfnt_off0001ac23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC23 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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