Malicious PDF — malware analysis report

Static analysis result for SHA-256 347ee33a7fc411a2…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 02:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ddfbc9ea5251461a4a208486fae9b59 SHA-1: 90d5abaeea2ad1513a8c11927ea208e2a558bc5a SHA-256: 347ee33a7fc411a2320c11541b771c24da39abd04bc77a6d9f3943d27115d612
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to domains that appear to be compromised or disposable, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the structure suggests an attempt to lure users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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://fmi.lu/userfiles/files/kelexosiriko.pdf In PDF document text
    • http://sillajen.com/fckeditor/_upload/file/zumomibibudabiwuraj.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/16012082885.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161165df3153e8---palapinidubis.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607636a03b026---zukuxoraxozawepizelawural.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/pixixizawogekunuros.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ee14331543d---lamozukirufadisovemi.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/vinirikibefumudelorejiza.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd5b5c5318---66669425177.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210621153628.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/41695927697.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/1abd47251e868ebd6b19189c22938960/rivajorolimewamimisimo.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/senunufinagetifulo.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/julirezileparuxujofexap.pdfIn PDF document text
    • http://crm333.com/documentos/file/wolimasi.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/57541974429.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///57511264797.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607abcc27ee70---71017471411.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/gogimuzalepogewaxuxetesa.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/53884512870.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/xejusibobeviwokumovo.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/kv5bavre7hb9t8du0miduug0m2/romevenekufaxexer.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/83212146154.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160786a5dce303---4464210007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+pearl+chapter+3+study+guide+answersPDF 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_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 11108 bytes
SHA-256: e03ad2894ceff29a48e5d065d26ad07be0a24c16b012c01cd4daf3405b7a0e27
font_01_sfnt_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 17856 bytes
SHA-256: 78c2f0fcb2b7689fc0183aa7f95142d2c56d299459cd6e23e1a544b9a97d899e
font_02_sfnt_off0001271b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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