Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb44bbcab949ce5…

MALICIOUS

PDF

86.6 KB Created: 2021-08-14 18:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 39a6ccdf5aa4357d43b5a765a3a39148 SHA-1: c0c5d8ae39eaaa3541bba18c732bdd76bc96cf15 SHA-256: 4cb44bbcab949ce523477711d3db2213de9dacbf7333078e3fc4f2e3d0400e26
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to compromised or disposable hosting, suggesting it's used to redirect users to malicious sites. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights links to compromised WordPress upload storage, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.amedna.com/userfiles/files/kogopasokewifogudukidelip.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad918a18a7---rugojudas.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/17571081246.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/8480e081db9412f1617a6eab7b8551c7/bujuxagamanokobozeduberab.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/nozewazeboxobovaripi.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/mvlj3tjmbf7o000o0ghdevg3ki/zaganekowurokif.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609240e14d57e---62071697488.pdfIn PDF document text
    • https://subded.org/userfiles/file/zadonovemadalewopu.pdfIn PDF document text
    • http://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/ritowakiwuzobera.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84794bc10---81303559947.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/b5737251d9978e83c129bfcab6022c0d/8290923539.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/85car5jpk81t5gqkscv6cth0ce/gawofatutexeja.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/2ca85a71805a144a750a32d46fedf79c/55646335354.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/26253910390.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c38e5e419b---fujuwosomelebogefemub.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1af7e2f7a34fcf6f20d46942e2bec668/28672460319.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/33139888945.pdfIn PDF document text
    • http://atek-ent.com/upload/file/monowusolowigolem.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54d452d52a---jilipa.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/xujasatuladipopejemij.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/b65uusag1u8d0hu59s5dpgf831/22749060809.pdfIn PDF document text
    • http://hiddenroots.org/clients/19739/File/xamixosavo.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe349e2272---bagijutokamefozoni.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/o45u0rubimdfijcvch2qs087l7/nogal.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc24cc6eeba---54267623175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dheeme+dheeme+song+download+mp4+audioPDF 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_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 10908 bytes
SHA-256: 595b5bc24c47b3fbf8f9ead3b219e88a8f2433cf8f7aedc8d2ca7980c16ffa19
font_01_sfnt_off00010769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 17332 bytes
SHA-256: 14ede09feb75c4a7ae004918da25e5e2da743109bf3260766b0019594a046949