Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4aad5bb25c01d2…

MALICIOUS

PDF

87.3 KB Created: 2021-07-16 12:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f88336e33621a339bac0d5ca9d8e3097 SHA-1: 30a325751dde0c91d70924490127b3d5653fb706 SHA-256: de4aad5bb25c01d2a581cd870f388d64106c13426bfdb619020c2da83802442d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS upload directories. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kasaitogo.com/uploads/files/fafoxujijivogedavufejer.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3a687c9cf3ec105084b65e9ffd92f557/vozuret.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/4ea8b7437a0fb245329d4e2c694ab93e/96407707551.pdf
    • https://arte-salon.ru/upload_picture/83461385570.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/a1crlsu1925a53tv55ou2u96s4/valube.pdf
    • https://mrdak.cc/uploadfile/files/69726756235.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b979c75e5---13951779250.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d725ca5fe4---90930019968.pdf
    • http://makinsushi.com/uploads/files/virawarozujejewili.pdf
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/65468510278.pdf
    • https://presstone.hu/userfiles/file/masune.pdf
    • https://aquaprosmart.com/userfiles/files/99846970674.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/830ecsggvbttg2ag3jd5409k74/nitelegepuzu.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/meurs6o8rdfpfk470h8sm1iu12/9055345080.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b42f5e6ee9a---40924006132.pdf
    • http://fecoil.com/userfiles/file/jijokuviziwupiwej.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160859d06b8b0d---jekenelokuxexaf.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/palepixasefulorarefuse.pdf
    • https://toocapen.com/files/dagezojuwitorirefepukeg.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/cislj9quf1nobm0ts6j3a56lqa/43708379066.pdf
    • http://www.chatanakonci.cz/userfiles/file/77358348324.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69d27bc075---dibaramuzovojofexofawa.pdf
    • http://uhy-th.com/image/upload/files/gavuramomasipemorufojax.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+the+central+idea+of+the+article
    • 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_off0000f30d.bin
089b056d0e0ff4b9651f4e0beb8e4c6ebfb4598379216d07151937714d825ac4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF30D 17144 bytes
font_01_sfnt_off00011fac.bin
043e64fe1e1115042f321f8ec41762ee5c2128daadd7de2de27c98e5bd3945bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAC 10568 bytes
font_02_sfnt_off000137b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137B9 16792 bytes