Malicious PDF — malware analysis report

Static analysis result for SHA-256 893381a2118db228…

MALICIOUS

PDF

106.6 KB Created: 2021-07-04 13:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b6964a8a834d23071e174d0999755e90 SHA-1: eebed010fd2da4e95388f1b6401efe18f873d48a SHA-256: 893381a2118db2281c441c864c364d3b1f73eecb28df018ca28863f7018791e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, hosting numerous URLs on compromised websites, likely to redirect users to malicious content or phishing pages. The presence of external URIs and link farm heuristics strongly suggests an attempt to exploit users through deceptive links, potentially disguised as educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://coretry.ru/uplcv?utm_term=icse+biology+class+10+textbook+pdf+free+download PDF link annotation
    • http://palyavalaszto.hu/teszt/upload/file/tebosiwakisomavifezin.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/32011252590.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18f2db425---kafusimeropasu.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/53636594364.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/121uvt6g7oc30jajco1r0u7n2n/lajewokifaso.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160806a2b49c13---89870027814.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d0ca44ccc47---gakaju.pdfIn PDF document text
    • https://triosms.com/userfiles/file/3444277926.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/wusos.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/tn2ju35io49evui3i6i9lqthj5/zolurowalojowatapoxeso.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/mfnp4d9pgt3bkpqvoupgb6bok1/77595096309.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8866d1edf760c71ff7d8868a18551598/muluzisifakore.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdc7e6807e---piziwopenefiba.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160905d010e16b---zazuz.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051404073773499.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9302f6b3---ludepid.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/nebizeleb.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/2183630182.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073de7a4781d---27556171008.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/vofilezivuja.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/uilrumpa6qcfj7sb8445o2lmur/17863255057.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/75283868461.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_off00013ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECB 11456 bytes
SHA-256: 6eeeda9f4a7cf1a8a0b21743417b451f61bab1d4ae471eaae4e9e29ece60962c
font_01_sfnt_off000159b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000171c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171C9 16620 bytes
SHA-256: 7fdc3dbcf4442a68f4d8eed5d7a788593aa87394b674fa7956e7b387dd02033d

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