Malicious PDF — malware analysis report

Static analysis result for SHA-256 404a48928993ddfd…

MALICIOUS

PDF

117.1 KB Created: 2021-08-09 17:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8a403bef7e4b75777d51c53b49c2eb55 SHA-1: 2a9c830529e100c41ec5a7cf434b88713e1494f7 SHA-256: 404a48928993ddfd1a6cc7a32f8b1869088c314b4bb77cbabb8a7f0f91d73350
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to external PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://imi.vc/upload/files/22595563316.pdf In PDF document text
    • http://firewheels.pe/userfiles/file/75232509515.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddf71d767e---vezamorenawisoletulij.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/usfogc92bmuunka486k67bfnru/32346925921.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/3ee998e3abc08bfa53f3e723c715659f/64813550978.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/xewovarogimizopax.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/bevupekiratumakivutute.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/5458245437.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/leduxisamibeweweviz.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089334c77c1d---78667076224.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/5649118e6cb7560264efc60601e563b0/36642097762.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/sacnf4ucsrcv8v3mqu4j1aboqu/napekuduxaxida.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab22613dcfd---lupusesiru.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/905ifn5r9j74v0t272u0if8pk3/kakokarun.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/wuruzinojuxupirusan.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac59a8576c---50543695891.pdfIn PDF document text
    • http://fairtradeportal.pl/userfiles/file/zezenusefokonibosojo.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946f1ace719---ladupoguki.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609c09b4cfbdd---mekojinukumexeweguvo.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/21385390018.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/84160610837.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b22157d5---koponebave.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/26343662312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=words+that+start+with+maliaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000167b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167B8 10356 bytes
SHA-256: 1780f6d7cc6c0ea1a19abd3c8e16828c1c703c3fa0a052d5448d8ddfc9804697
font_02_sfnt_off00017f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F1D 16628 bytes
SHA-256: 3e3c67443858766c9089f685a134ffee4a63394036d0c2473ccb22cf6c74eeec
font_03_sfnt_off0001969e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1969E 17764 bytes
SHA-256: 4fb4275b60f7743a16ec945deddd8f85002cfd8a38e3a6fa582c1a66f1ec8fa5

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