Malicious PDF — malware analysis report

Static analysis result for SHA-256 f865c6388187d168…

MALICIOUS

PDF

99.4 KB Created: 2021-06-27 04:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b815c91b9eabcb509843f9dd631c067d SHA-1: 48f02e0a1af8cbf4cfe1e1fdd888631b86a94e99 SHA-256: f865c6388187d168075ba524cad14a51371005f1e1d045330150aa29a53f7f1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous links, many of which point to PDF files hosted on compromised WordPress sites. This behavior is indicative of a link farm designed to distribute malicious content or lead users to phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073750abb5bb---27216726871.pdf In PDF document text
    • http://bet-balance.com/userfiles/file/67830643239.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/83189957958.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e8f8fe90---fixup.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/mifejano.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e57cbf0920---zepem.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f2871124e---gifikoz.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/bazanuzosabafatu.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/56555702343.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/zafusabobigewezomaribesuk.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/6aab31a02ae2315a181cf43031951c80/gotokaxiwanepabekoxani.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/dupuseluzuxatuvubimudapa.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7qui0cnecu66at23c5tl6dbgm3/49214265113.pdfIn PDF document text
    • http://stevis.cz/files/file/97621406784.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/buziguxalegigi.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/xulasiw.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/dokoxifakujoxagotumal.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/66536233827.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071ad5ab0f5e---niwunevun.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1185f2e9ad3cf4060f720cdf2fd6378e/goresuxukuvazikupufukokiv.pdfIn PDF document text
    • http://tipiland.net/upload/file/xetas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=square+root+of+2+plus+square+root+of+2PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12044 17708 bytes
SHA-256: 66066945f4ea2106606056b6633a02eb0c6984893a599caab55ee5d9d146f397
font_01_sfnt_off00014e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001665f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1665F 10596 bytes
SHA-256: e61685a27cddcfb514e863c1138792427e6031fb5fde985af15b709326d9f349

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