Malicious PDF — malware analysis report

Static analysis result for SHA-256 d879819defe46ff7…

MALICIOUS

PDF

102.9 KB Created: 2021-06-29 05:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 21c685c6a7d2fc86572bc3897907e10e SHA-1: 1f69c629356fe6b1a4158e30b694121dabb40b0d SHA-256: d879819defe46ff75e7cd896f138492e12ae8f19ffb585da08c1ff547172e999
156 Risk Score

Malware Insights

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

The PDF contains a significant number of links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to direct users to potentially malicious content. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9358

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://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/nugan.pdf In PDF document text
    • http://charivne.info/images/file/pukomekibesozusajini.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609485858988a---modimigumipewunetekopi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b3235f75b---12888435139.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/sotosudagukesavus.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/vewenivesizawijezuj.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f2fae6565---dikadela.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/9ad338052122ba4ee677f8aeae9d2762/sanowuv.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/16d78e160ad8a12c0908addfc1543c4f/bukobizevenaropewezofiz.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c48b7188adf0751a63d1a150fc3c1662/fodumafafonifanokaperupo.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/ac0f2f4c84d07ade3c3b5396bc04f790/42595952227.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/807e6f4e3730a3560fc1ab377d77d64f/76037018318.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/28513968341.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/6940807954.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607373e1b59a8---lotojopi.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160800c35beb33---14755722438.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/b87d736b1c3f0894c412c01b98a81c15/fafizeb.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072eb17d68ca---15203547275.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/rorud.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/mj8q3q184t7p2m5qh8g9pj2hai/14242322024.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e46c655089---bumasagutiton.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16087180e6d832---bejigi.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/7857404641.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/51237171627.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b199df4f7cb---54601400576.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/62790282708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=menthol+chemical+structurePDF 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

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001094c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001215d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215D 16456 bytes
SHA-256: b567351d8817b452d7c2fb9a0144519bfd530866bceb2805c1f9ef2299257e42
font_02_sfnt_off000137aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AA 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_03_sfnt_off00013fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDF 10588 bytes
SHA-256: 6e814e0f2ed4e12a6687765d3b6ac784e0b0ced8621492c258a1fd7927c077fb
font_04_sfnt_off000157d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D6 19712 bytes
SHA-256: 157938f14a8de2fd5bb7a040cb91103c00e7f22d9193ac83f08c90ed1378514b

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