Malicious PDF — malware analysis report

Static analysis result for SHA-256 32f8e0b24cee73ca…

MALICIOUS

PDF

88.6 KB Created: 2021-07-13 17:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 427fa78f7234226e3edd45667d753ee8 SHA-1: 984506adf7ed1da09f34643c2dd3de6bc50211ac SHA-256: 32f8e0b24cee73cab8baf6f0a03dca5bffc8e753215202890019038e03ef5600
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of a link farm on disposable hosting further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://infrive.ru/uplcv?utm_term=personality+plus+full+book+pdf+free+download PDF link annotation
    • https://cuisinescartier.ca/upload/editor/file/52248406994.pdfIn PDF document text
    • http://scro.ru/pic/file/98355716612.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/99989991276.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/foporaxes.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074956198f5f---xanemede.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/78632624367.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/82314704864.pdfIn PDF document text
    • http://e-district.org/userfiles/file/fenajuwizoreti.pdfIn PDF document text
    • http://446888.top/userfiles/file/32352395935.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/fozikawogira.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e78f989c12be03b2f1f50fce5ee95c23/dagom.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fac89de67b---ropij.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcd1e31138---2361411776.pdfIn PDF document text
    • https://agatanorek.com/files/file/memeg.pdfIn PDF document text
    • http://93564497.com/userfiles/27335168628.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/mbehei9faf25479h11sn929klf/raxirutazuboligafi.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4d4554948---domilefegopewijadivuler.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/90851260975.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096266ea9bb9---84089334114.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/22742646327.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/db0bd8033b01c5143b09e63f98179387/wegatikexi.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f22c109861beb46eeb55d492d0f8715/belanafo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6305eb399---22554941274.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/05727d9d4125375e1763e9c0553eba93/vuboba.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/70263295108.pdfIn PDF document text
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42B 17204 bytes
SHA-256: cc135aae53eba026415a6cfc9cd7bc94765217e25c6897e3295dd2aa354d4c13
font_01_sfnt_off00012161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12161 11024 bytes
SHA-256: 1a2a6457fc64a5733c72f663763fa7e729c3add1bb0310e1af3a31a119442a48
font_02_sfnt_off00013b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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