Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05662f8cdc55b1a…

MALICIOUS

PDF

88.5 KB Created: 2021-07-04 01:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bae90aa88d59646bf1463750f609b3eb SHA-1: 46d3de5b3386858f7b24a4f90b14d8b226a30e2b SHA-256: f05662f8cdc55b1a771f77a5998e99a63c99c364547c32e89ecd3af4102bbe88
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, including those pointing to compromised WordPress uploads and using UTM parameters, suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=grade+1+reading+comprehension+with+questions
    • http://cravaluos.com/ckfinder/userfiles/files/95406263940.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16074960eab4ba---lagaxovepotagubewofe.pdf
    • http://bannails.com/fckeditor_userfiles/file/50522673428.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/fho35fc4akl167bl1pn6ikeudo/99591188032.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c305a1047---84263012411.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8f0a22c1087f699f175b2f9078f9d877/88036479903.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/a5d391ca5cf37ed4e1e05319fcb1a719/gabite.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f93b8f2a77---21838444231.pdf
    • http://altinay-law.com/images/file/77609290881.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad53c6321a0---81259533030.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609340af646bd---69309972479.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911114d558e---92690509025.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d8ed35b022c384e7869d735c62e54512/fameribelajataz.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/jajajomom.pdf
    • http://01host.ru/userfiles/files/22024697386.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bef4f3b4cc---50817242462.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/b1726221f811a933792726c1e8ee9149/4401940198.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/op7i8d44vqimh087qla1vqcn3h/73081882028.pdf
    • http://dolphinegypt.net/userfiles/file/78443077118.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2df772553---butozegejewigazi.pdf
    • http://jnnycc.org/userfiles/file/59091572313.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/4fd6c7c9323317b47ab72cfafded58b2/84147991788.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/jawosolib.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609915a3bed11---lozejuxaliti.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8ad7c2b60---67505371660.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f810.bin
72246d825534a499fd9ee4e051d341fe88421a69daa6a6de741ba63236b9c96e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF810 11336 bytes
font_01_sfnt_off00011226.bin
c48cd215550e5fa59074c5316f38d429f8428f6ad50b88527eac0d2146e14130		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11226 16340 bytes
font_02_sfnt_off00013c58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C58 16792 bytes

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