Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eeb90e6569ae9ae…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 21:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4416400277621507e7064e8544a29eb4 SHA-1: 828dd723195e6424df7d1cf39c30dad2f0d91997 SHA-256: 6eeb90e6569ae9aecdc08346801732bfbae1fa131b1f6bf5736f9dcc34fd07f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, flagged by heuristics, suggests the potential for further malicious actions, such as exploiting vulnerabilities or downloading additional payloads. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://nomylo.ru/uplcv?utm_term=mhst+the+adventure+begins+mod+apk
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/nalesofumemok.pdf
    • http://faurerom.com/userfiles/file/jikanetutu.pdf
    • http://www.centralperdana.com/file/51040539800.pdf
    • http://shannonlakeestates.org/fck_images/file/wetoje.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/8lt99m5dco0cbou8mhjlc3nh4t/vapupezemukuze.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b9911100---fodobemupebawokorusuko.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143329cc5546---jigivitetiguwezelusoparek.pdf
    • http://wksx.top/images/userfiles/file/11540691495.pdf
    • http://palmdale.thepokeluau.com/uploads/files/nazojimif.pdf
    • https://eletmodguru.hu/files/files/vigodojak.pdf
    • http://zhfangyuan.com/uploadfiles/files/zuzokerupasodanedez.pdf
    • https://eurouniversal.eu/ckfinder/userfiles/files/74848941656.pdf
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/53818603861.pdf
    • http://eschool365.in/js/admin/uploadfiles/file/62908645517.pdf
    • http://ecohouse-lab.de/userfiles/file/gimunavasolaba.pdf
    • http://abwjefferson.com/uploads/files/30827056888.pdf
    • http://moonlightmontessori.com/upload/files/kopilotafitivisitinudu.pdf
    • https://abss.pt/userfiles/file/39018689706.pdf
    • http://sgyscom.com/upload_fck/file/2021-9-17/20210917203546183207.pdf
    • http://sintellect.ru/Repository/file/lofufinuvenevog.pdf
    • http://samtle.net/ckupload/files/57672804087.pdf
    • http://rc-modeller.se/images/file///gilubevuxafadip.pdf
    • http://antoniolescio.net/userfiles/files/93534864670.pdf
    • http://njxinbell.com/upload/files/tevewotiduvekeru.pdf
    • http://hart-metale.pl/gimnazjum/userfiles/file/wosabiberuvesabuzikoviz.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/sfjd7e5enit8npdrpbbfh52td0/wefudonitalarus.pdf
    • 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_off0000df3e.bin
142b0e48e0c632ad7168fd55945bbfc95d85f5dff45a9fa4e35f9d4c4d619e6b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 11184 bytes
font_01_sfnt_off0000f8cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CF 16792 bytes
font_02_sfnt_off000110e1.bin
0b25d8f4e1564a9334071f62f03d728fe72de5c1e15b042c11afef601170b456
pdf-font-stream PDF embedded font (sfnt) at offset 0x110E1 18820 bytes