Malicious PDF — malware analysis report

Static analysis result for SHA-256 effd20e5612bf26c…

MALICIOUS

PDF

79.2 KB Created: 2021-08-17 01:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b853372d4c1260cca6b9929df603231 SHA-1: f1016a10bbeab305d14dc61fb7a6202a7ad72d21 SHA-256: effd20e5612bf26cd3f193ea05a676a01845d9065757dffa1fc6cf0678832b83
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 it functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting. The primary purpose appears to be SEO manipulation or directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://veterinariomauracotti.it/userfiles/files/goledaxetok.pdf In PDF document text
    • http://controlsystemco.com/cache/fck_files/file/91508864994.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210528045341.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8g9gn10c39bflfpqll6ip3q104/divoxawivokowatuki.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/14546279260dfa5ad41edb.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/3ad1jtb3dtk8h1htm5olabd4lm/63578846230.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/b2b42f70052d13e0ebea1e295f32bb2c/88087649025.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/15450263053.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/93505985184.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/qqinive036ge5e1qh7fa63mq74/61701130081.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/guviloxewawakifupamakumo.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/karewezifuwawelekuv.pdfIn PDF document text
    • http://texmet.pl/userimages/file/xutozu.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/1070173135.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/fizaxorenegupakomebejive.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/bopijos.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/a5nu38qjum9eemkh01t2u45cp6/17741893189.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160780e143d903---lofisizejitunisafujunonu.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/foruvozudafonud.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/c98c3141bdf3579a03a54826dbaa312b/53330228654.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/10130044737.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/91ae594e6d7b6e7346684e505b1a83ca/nadovipatusakadenava.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/27528122109.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/75639698034.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/hb695r8mqvidslin2q2f4erco7/naserobazenogapog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=akdy+65-in+stainless+steel+8-spray+shower+panel+system+installationPDF link annotation
    • 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_off0000d01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 16248 bytes
SHA-256: 0e414ad12bde672fd115403f7eb09ba1ede30a6e6d9d0b5e844f88dbb3534752
font_02_sfnt_off00011206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11206 11472 bytes
SHA-256: ea195126389be5aa77827ebb464400fff0dfddbc466da927632a597886e009ec