Malicious PDF — malware analysis report

Static analysis result for SHA-256 519302cb4cbf9ffb…

MALICIOUS

PDF

86.9 KB Created: 2021-07-03 14:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f66260d16d9e155ed3ab0a5174916223 SHA-1: bee2868244eccca88ab1ee66ba88e48889dbb7cb SHA-256: 519302cb4cbf9ffbbbd516744a0a1b4a291ee60feafae6b415cff01b7f70fcb5
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. Heuristics indicate this is a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed54c4c525---nudasak.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/lataremebabodeligikaxilib.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/31326551971.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a523bea2c1d---18408439636.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/8631ddca668c245267dedd67acaef86e/jebazov.pdf
    • http://domainecomps.com/documents/files/67345041949.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/c1b04abf7b9c98087139f5c0262f6377/39423332593.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609224dab573e---jitanaxopixaj.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/vsf8jtefgop65hj6gscjak88g2/mofazutuwajuxixojof.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//navujubimorosejudobefa.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dacd04bcd---82634220832.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160943a1b6ac53---2638059742.pdf
    • http://afgventuregroup.com/cfiles/file/71464669620.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860b65345f2---feminof.pdf
    • http://location-appartement-venise.com/italie_documents/files/baminadiparafanijezaza.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/15735565817.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe4901759f---gokewopovawore.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac648b5c721---29501198583.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/wepujelanopetalokadu.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d98f3c5ad---26253675760.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/61043087987.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c5134e21344---vidafaletav.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a488f9e2548---26206305613.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=non+restrictive+adjective+clause+examples
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e49c.bin
035df9c50f7484734fd97c03f57eef5f341b08f20b9f3f03f383952d4a8e2bad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 11052 bytes
font_01_sfnt_off0000fe60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 16792 bytes
font_02_sfnt_off00011672.bin
f2734c03e01167e37ed85bd77f644b9197876b283fa0e5453407b66cf1f09b1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11672 17240 bytes
font_03_sfnt_off00014323.bin
78b0a163e4eaea4fd1c276a6e09b3ffe8714eb7cdf5cd8e6d31ca7f4d18684d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14323 1932 bytes

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