Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd44a8bf05c1df0…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 02:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dc4c8aefaf85ed974beec524f9823971 SHA-1: 4d760cc9947efa8b6d3a23ddde201aed0e41c540 SHA-256: 1fd44a8bf05c1df0afbe014b696105f6c05946399f048647def54c94f50f8a5c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites and disposable hosting. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ML_NYX_PDF_MALICIOUS classification, strongly indicates malicious intent. The embedded JavaScript likely facilitates the download or execution of a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=grand+theft+auto+5+free+for+android PDF link annotation
    • http://vanharteyoga.nl/uploads/files/95955286966.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/chut53ne98agjv1t6hegqnf1ai/pifuvibotizajomezisopox.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/sozemimogazovigobogo.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/68868192866.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613e98a2468ec---piregerabeli.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/vopara.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/48446841380.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/21232099421.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/otlgbo0gsqmu4s42rcbipr8lk7/dalemebezixanakevudoweto.pdfIn PDF document text
    • https://red-adlay.com/upload/files/foturusepisoridawiboxog.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/54170394899.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/56324709211.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/41858987242.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/ed2ff10ef39ec661dbe35f3750f7aebf/99712483035.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/79429287652.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/18851319211.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e931ef19f4---mebixutinepukirivizonijox.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/sibivetezugatixuvowave.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/bejotesusor.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/3265619653.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/68412542749.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/11640240703.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_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 18068 bytes
SHA-256: 489930633194ca6b6b830e5f125bb323d4a6d68c3bcaced777c05d8bce4c5030
font_01_sfnt_off00011181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12998 10508 bytes
SHA-256: 96e9fbdafd9492318bbd613c2780a60b959a98bb45fa4fae010f9df9d88a4aaf

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