Malicious PDF — malware analysis report

Static analysis result for SHA-256 8216c77939666987…

MALICIOUS

PDF

94.4 KB Created: 2021-07-26 02:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a1beffb4efa7feb37b8477059494b249 SHA-1: b9672ef8393ccbcd413fb1e22dd4b51f0b898c47 SHA-256: 8216c779396669875be1ac297f2d1c6c00c4bc5fe4b21bb8843b0d52ae2ff7ff
156 Risk Score

Malware Insights

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

This PDF file was identified as a phishing trojan by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://cleaner.pl/userfiles/file/xiruwanapimupo.pdf In PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4db0570e6---zomepuvozoguxezefike.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c7d45bcb122ae2b4853048a69a85fc81/jidozidatimufem.pdfIn PDF document text
    • https://agatanorek.com/files/file/55916794570.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afa8f867f13---fudotigezivedi.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/38442112103.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/de4c63e7a4e91ef0093f4154c0b61134/21132857618.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d56970f92b---84232554730.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a935d9899a9e62e6d06a175826dfcc46/vezizun.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/52292c48d96e7b9f00a963f83919a8a7/nanunolupexazamez.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095001008bda---74167839320.pdfIn PDF document text
    • https://majubesar.info/contents//files/21634152113.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/28706762147.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202162652924837.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7314cd812---jofinanevavemuk.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/govagux.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/5621373531.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/noralimudak.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/komavevikovuzajejutej.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/nibenerafe.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/bobebajawuvixe.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/vu9b0kjufriiq5dqb7h7cf6gq9/musoda.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b54594257---kegedokifaxewagatefaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=muslim+pro+premium+apk+revdlPDF 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
stream_006_off000143f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x143F2 18936 bytes
SHA-256: 880bdd942638d8aef918e3659143980e4ef0bea01f552f7b7f6aa79330035434
font_00_sfnt_off0000e4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B8 18856 bytes
SHA-256: ed3a8cfe6f4ba4d48558e92d1d347d46d619f116aa5f0bacf5dfd6f1ebdde994
font_01_sfnt_off000113ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AD 10604 bytes
SHA-256: 4c926aedfe151383e6557d97b7f0a0b5de20089a3145e36f8c5aa3c8e08bedd3
font_02_sfnt_off00012be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000162b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162B8 1728 bytes
SHA-256: 8bc175f4a4f5cac64792babdad517d65aba3552260b022de7cd4c86cbad4686c

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