Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a42bb75886728d…

MALICIOUS

PDF

74.5 KB Created: 2021-09-18 01:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53629b7a1da304bf1d140ee480063cd1 SHA-1: 29fd4de65b8cef485815eb7e257c7ad08113808a SHA-256: d4a42bb75886728d1573b04f39adee54cee82b04b2354f177c3e2b9513e49b51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to external, potentially malicious content, aligning with phishing or credential harvesting tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ofly.om-digitalsolutions.cn/upload/files/lizapav.pdf
    • https://hkparkkonutlari.com/image/files/gegekotabujadipixize.pdf
    • http://esebtekstil.com/resimler/files/mizaperikuxebak.pdf
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/71825734369.pdf
    • http://urjabatteries.in/userfiles/file/mabevera.pdf
    • http://kronikarp.pl/ckfinder/userfiles/files/7576860054.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe4e445078---zuziwisalago.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/lmici05hf95auu73lfjl2b9l00/nanoganuzedabe.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161401acdc595b---tedegekisaworegupo.pdf
    • http://abwninemile.com/uploads/files/zumevisosi.pdf
    • https://pui-vital.ro/msg_media/file/16322219252.pdf
    • http://saveursetsavoirs.fr/image/file/josuritututu.pdf
    • http://dichvumucin.com/upload/ckupload/files/88260800086.pdf
    • http://worldnaturalfood.com/image/upload/File/16097772432.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134303e67935---29468181462.pdf
    • http://wsm.hk/images/files/65280286870.pdf
    • http://massimomoroni.it/userfiles/files/90987498786.pdf
    • http://raffaelecavazzoni.com/userfiles/files/fomemil.pdf
    • http://jandebruijn.com/uploadimages/files/50853831842.pdf
    • http://ossokahve.com/upload/file/56773816613.pdf
    • http://ville-dammarie.com/ckfinder/userfiles/files/60174650683.pdf
    • http://digitalpolicycouncil.org/imagenes/file/banukubuxika.pdf
    • http://myoffice2561.sesao33.net/UserFiles/File/gojawog.pdf
    • https://birotex.rs/images/files/13654446586.pdf
    • http://gatewayhotelbangkok.com/upfile_hotel/files/juderepurusolilazemome.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+check+android+storage
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c09a.bin
595ad28e5c01f34440b83b891abf85f5f5edf3e9d1fdab7f522314585fc7c420
pdf-font-stream PDF embedded font (sfnt) at offset 0xC09A 16576 bytes
font_01_sfnt_off0000eba7.bin
19f35000fabc0140743a70e01778dccf589a3c1bbdad4e2b03bb570adfa37917
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 10772 bytes
font_02_sfnt_off00010439.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10439 16792 bytes