Malicious PDF — malware analysis report

Static analysis result for SHA-256 7acaaa4d19169118…

MALICIOUS

PDF

85.1 KB Created: 2021-06-29 00:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 01dacf1d0ffc926a3af32551bdf534cb SHA-1: ed312d6ae02838d366e4fb5862f63a29373efd45 SHA-256: 7acaaa4d19169118927d5e4e5bef4de996e1c693fe5e60083c3edffe05825243
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The embedded URLs, such as http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b3e194a9e---47404698225.pdf, are likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/72d271cf6545c332559980ce7ca817f9/44914744138.pdf In PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075054fe42e3---5626663776.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/n8j9u720mlk32s8c9febu4a6n6/zizefanaxateka.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b66f36391f3---tufuxejaguzer.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b3e194a9e---47404698225.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/61932110170.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/40ec960fd6eee2b9eda629e9288a3551/releruwosekatutares.pdfIn PDF document text
    • https://nicosiacaffe.it/file/28034258952.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/96536739808.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c5c5839703575cf9b88065f6b708681a/sexolusirivuped.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9991694df---wasawilojujulesofu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/dd6f518538edb85c61ba6e3716f79162/tepagezavimudaxodivufona.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/91523057104.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/05e79abb7b079688ddafac504e8ab725/29364774764.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb552958ed---zeminasixinibijagusuwafo.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210607_3B47C2C01B42E758.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/63746452162.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3e9f133a5fda6ec68eb609820a2b2c10/77616680475.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad93d6e447---jigaruveri.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0261107001621537788.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/68860891314.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/gowulosigemas.pdfIn PDF document text
    • https://alutat.com/data/file/76875472523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=insect+with+6+legs+and+wingsPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 10636 bytes
SHA-256: 7c2d16a469091184b6ed1ecd397c3e6ece5350674f76055cecf91ef92667fd85
font_02_sfnt_off00011904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11904 17772 bytes
SHA-256: 617dd359241e291aebe44ccfd0af3d31c8a5438263c2b4f8ad901d6adc6a63ed

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