Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e24bfae70ae7d8…

MALICIOUS

PDF

93.2 KB Created: 2021-07-17 23:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8cb84fc3a753a2918e0311c5f6d84309 SHA-1: 99da6e1badd9de5974f6f20472d2d85107944808 SHA-256: 71e24bfae70ae7d88e00fa7e7208ec7481ab34f07647484dd8f389a7fb6b940d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9843

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://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/iitm9kr3uipujeusmbbb4pohb6/digukokejaliranixenadovav.pdf In PDF document text
    • http://chiangmai-esc.net/user_img/files/7833778192.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/abdd1e4e5ef3e2926a3f2654d97ce5c1/muzeburavizadobow.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/28788095842.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2274aa855c---26241882459.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/b4a66488c8a10eed835ba40aa0781c3e/legukinolejidevivibufaser.pdfIn PDF document text
    • https://irrisyst.eu/files/file/derilabowudukivikomuji.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/tamusa.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/976a0a1fa8ddcbd009b6a0685a4a4258/wesefetafilovataji.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c217c546e4e---bamokasegogu.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/8fad6330222575d222d81d0d86ecdb35/77407357665.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3e651f332---6939709231.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/70356723261.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/bukese.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/9dc46e50a10088d0d0dedcb362c4b06c/podulituzigi.pdfIn PDF document text
    • https://ka-base.no/images_content/file/pazidiwikubun.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/tebova.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9fb98d9586c67d814b79809be7e956f9/lexebilopodof.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/37912732397.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/po40nqs1em75mjv9otvcmlign0/sekejoketudezorisa.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f575a97fe5c8bb1cdf5bd08e543791b8/povulon.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a889203788---63337993531.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d70e2bfdb---78489676082.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/dcddcf087d544979b59074585fa53507/2865056253.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/63790929478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=definition+of+supposedlyPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012321.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12321 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000d1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CD 10444 bytes
SHA-256: b351f4ad8176f1ea9346c71c3fd5dd1971013a3489475cb1c744a33f16ec15af
font_01_sfnt_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 23288 bytes
SHA-256: 111b7d1dd61c8583afe4bd9c471ee7f63138162456a70a72c0f318eac40c1ae4
font_03_sfnt_off000140c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000158cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158CF 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

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