Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3712320055e704b…

MALICIOUS

PDF

86.9 KB Created: 2021-07-01 15:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 300b49c2abbb4155314bb0b113ed1284 SHA-1: ae2cebbfa8ff39d811b5f6f014c48fb30d896dc5 SHA-256: a3712320055e704b7393f31c1800100ecd24bd8b38511e6953b41f7db3dd6652
156 Risk Score

Malware Insights

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

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, with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=stretches+for+l5+s1+bulging+disc PDF link annotation
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/09645eddce5c5cbecdcdca9af756041c/kegivojunafosaguda.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/51300030479.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/g3c3ebgsfq18nubt7rdcphve80/23287918192.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106020048.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/wamotuzejimojalod.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/031ce2b01c455309151bf70fddae1f7d/xufabawozovow.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/11674267379.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/901dab6ff29f9b79f1a6d06021174497/susimataga.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbabab50bc---90688354943.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/demusozote.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/41010368415.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d29b0ca1521---33485348077.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/wodaluloz.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160701916ae7a8---jifofa.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c517beaa08a---69389943252.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985918733b9---12462659342.pdfIn PDF document text
    • https://avvocatoboretti.it/file/61208567232.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b66657c0e---bidasusodus.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/saras.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210623_121529.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d21299b5---zojizefi.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/52c093b53ad03450474849c68c28af1a/60880715567.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/15f45008bb449cf1be98d9beb827e03f/xazevinokasi.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/10815034230.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF204 16348 bytes
SHA-256: 6ae04ed452368181832c69e844fdc426268e67fd2fda055065ea3303c6d3243a
font_01_sfnt_off00011c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001347c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347C 11096 bytes
SHA-256: 481f8fb4c9b0d56c485846a4356639aa588b211f000f2f71e493d2f009020439

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