Malicious PDF — malware analysis report

Static analysis result for SHA-256 e358b169cb97d469…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 23:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 933e90e0ab7fde87d6d53dd15f716069 SHA-1: 2525745ea9a0298fde9d0c113b852b53618deb15 SHA-256: e358b169cb97d4694a8471d8268a26dd86e95f80fd225330ab4fc0c7ddba3398
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d071b443c2---jegiju.pdf In PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3e56f6b439bdcac801a490763edcb8f3/27401032677.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160817c08a1e3d---47974349344.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210903105650_MTg0MDQ4NTYxMDg=.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/342kro20ev2a4qhj259dgl8t0h/78910432548.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/mvldlj3gtc4jv402gkar65amra/71749537824.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/pigafuz.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d4de2e63a9e80fcbdabf4c5dcf006beb/53947342756.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b39a18623---90469913247.pdfIn PDF document text
    • http://dogable.de/userfiles/file/99730364344.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/idatui9hkqvi7r79lsremni5pc/garelipobal.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/59182709070.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16076b831623fb---kununujuvo.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/87436048495.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/72386029436.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/34151917826.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/fibiwufijifivo.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe698c9d4d---41862617495.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/11900956531.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/80d321a058b5ac2122f178850dc26f1e/44270845886.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/72007013737.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44f8458af2---niwulirerubukufitofapi.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/39816028274.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/duzikamiveriwugexosazud.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/v4sond6fjfqrlk2lae0hop9s02/99814524702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=recetas+de+alimentos+alcalinos+pdfPDF 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_off0000e28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28E 19516 bytes
SHA-256: 483c07ea0184506c6fd9c584ba65a985f02d668ce885adf4d2ad010bf0a385b9
font_01_sfnt_off000114e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E9 10728 bytes
SHA-256: d4d3087ebf52f2a7b9732f27c48a0d70b660b58344a4822723771426edee885b
font_02_sfnt_off00012d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1