Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18413c6d398d1e5…

MALICIOUS

PDF

86.6 KB Created: 2021-07-17 11:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03602b96817a64feb204289a22e9422b SHA-1: e0b0dff8be453cb2a156f035e1d3c5ceccf21f2b SHA-256: a18413c6d398d1e555a2103be1d9d035160cc04d7e81c2cdd8b1a9f3d763224a
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress sites, suggesting a link farm used to redirect users to malicious content. The presence of external URIs and compromised CMS upload links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/efb6ee7425f8dfd9f2166b4992ddaef8/29737789136.pdf
    • http://anvlaw.com/userfiles/file/65796675351.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/327133b137dbaa607a64a06e44b762f2/wazevotabil.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083337804ed0---44355797597.pdf
    • http://broorybulldogs.com/clients/33993/File/xasiwepufobuxefevodisarot.pdf
    • https://autotrans911.com/thread/admin/uploads/file/latowipelinakumabixedo.pdf
    • https://propactionvehiclesuk.tv/userfiles/files/18955449956.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794a312e13b---lilisefovisaba.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9856b786e4---4583842255.pdf
    • http://xn--h1acbpobggs.xn--p1ai/data/files/lafifolixarotaxilelokefe.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/c53b210ba47f3ed8a00fe1997f3cc289/lasomu.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/8c5e33e534a05ec0f6b60806e610debc/67160406822.pdf
    • http://lyshiying.com/d/files/gobigajawamizojidigud.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608671a7261c3---vezorozotojo.pdf
    • http://kulturazebrak.cz/userfiles/tepumazutav.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7ee897a254---nofojipotapi.pdf
    • http://charivne.info/images/file/37369124698.pdf
    • http://geometracosentino.com/userfiles/files/nakugitofof.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078f41fa9649---xadugepukapogeripisunafas.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=james+carville+and+mary
    • 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_off0000ee47.bin
0e05a1490d7d8a4eedf39357c6e7d5e03422f76f8b5ed38bd07b1f6832f3c7fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 10484 bytes
font_01_sfnt_off00010608.bin
f77df64c9b6cbf21ad429d4ade1f87345af2e5403a61c2acd012ee13029ea5b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 17496 bytes
font_02_sfnt_off000133dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133DC 16792 bytes