Malicious PDF — malware analysis report

Static analysis result for SHA-256 659b379153dde43e…

MALICIOUS

PDF

97.7 KB Created: 2021-07-27 08:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 49766274c9e6a4b4584713c26ce28573 SHA-1: 2aff41d89b8e04c84de882d06ae3eb7f50b473e1 SHA-256: 659b379153dde43ea23379563f06a0c8ac3b9a4a8b926026d6269369b17b7f65
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to domains associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9883

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://alpha-cp.com/userfiles/file/vesofozamos.pdf In PDF document text
    • https://cortemadera.com/wysiwygfiles/file/vokelotopotofakomarekilew.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2cc142f643---11174025333.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087731d42f82---sixegubotebiguxiwuzep.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/13928981144.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c551008837cfbdf68e34f322b795c313/kewabejilufugusa.pdfIn PDF document text
    • http://abnicum.com/files/file/60785081923.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/6020497748.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e9289bf3218---lumejojelesiz.pdfIn PDF document text
    • https://masihpt1.com/contents//files/japunedixapuwejiditude.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4836db4a36---1473588398.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/2849501739.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/55172497088.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/60664694875.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3e56b674---sowizus.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/53209039934.pdfIn PDF document text
    • http://topas.lt/userfiles/file/79566317310.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/84374603114.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/b7g8e2jq36oeu6lauvg3n7751u/3166911955.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/rexofonabomudupibemibifos.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4f4a81806---gazesokoraxozevagowo.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/bd77aab87b354c93d1f84b683ab9c4ab/34939693655.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d42f7a6c292---tumitivajum.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/4383413415.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6edc54936---nebafasureromel.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1c3b8fa9c4dcd9c6df421a1cba0df28b/85924696049.pdfIn PDF document text
    • http://masonhn.com/d/files/gamubibozulubafidisami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=harbor+breeze+remote+control+pairingPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A05 17972 bytes
SHA-256: da4b2eb1e8fc774191c0903aa7adcf4f4c07b958f6905bc0e078389c89ee8105
font_02_sfnt_off0001485f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1485F 10740 bytes
SHA-256: c4f0d0f11e92c29614819dfd27fab0427e1f0978fb2f3dcbb48638a7cf126231
font_03_sfnt_off000160c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C7 16704 bytes
SHA-256: f3a20dd5e700ae390a0fe49f1c8ffa79b3fb96a0bd172bb38c6ac14fcf60674b