Malicious PDF — malware analysis report

Static analysis result for SHA-256 155211b1fb754240…

MALICIOUS

PDF

83.7 KB Created: 2021-09-04 03:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c453ee478b745453a0fee31cb3af6628 SHA-1: 9d287badae43c4e1bf0f13ef6015d95c34b23540 SHA-256: 155211b1fb754240f807c468b2c5f57d65df4bfccfcc0f1318e84e7b692b11c9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malicious content or exploit vulnerabilities. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, not user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cde531b4c---44415954330.pdf In PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8c57a0397---ziwerolejuxigobu.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/dudajaviberogozifumupok.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecbbd5dae2---wuxexen.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c770e752e53---69324055583.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/sd032g46q3cg9mdiqoe9bqv87g/fawaxejufipolif.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf945ebd46---javikinofedunesitupukuz.pdfIn PDF document text
    • https://topaldanang.com/uploads/image/files/golapivinimesezedofedarev.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/49857541486.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/derejogib.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/xenekini.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/47186794238.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/namimija.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/84604467374.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/tunetip.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/23857993093.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/gugoloxaguvebi.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210904073808.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/81471223314.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/risuzinox.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/bgqlnepr2dmdlth95vp4vb00q0/tivanapuliwaku.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/72395692444.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3a4e4e1b---55916517451.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/86f48ffe5dc5954772e03c5cd681e8df/vujawodilirupetifus.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/sepejilowotosipakot.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/lobokafuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=english+tenses+worksheets+for+grade+9PDF 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_off0000dfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 10960 bytes
SHA-256: 0b790a01d48d2e415a863419bf691a362076891136a490b2c021371d7f1ea0e4
font_02_sfnt_off0001112e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112E 18440 bytes
SHA-256: 67af5151e9355d860bb75f312181bd578d05881ea8d99af06fc7a88a27f03f80

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