Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ee065bec503e85…

MALICIOUS

PDF

77.2 KB Created: 2021-09-12 14:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82982a90a66b6b13e4ca196654469858 SHA-1: d5d5792d0e3f3c88af8fb27d814959713de1a691 SHA-256: 57ee065bec503e856ba443409744b8524b87b62e356c1e7c32d42a0b40b43273
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are characteristic of phishing campaigns that often leverage embedded JavaScript for redirection or exploit delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=nouns+ending+in+o+add+es PDF link annotation
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6be0b2e3---leretur.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/bivibomuwarinotixipur.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131aae3ae42b---18643992936.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/liranexagabisonu.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/21301478228.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/nesutijetiritoralekonoza.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/babugaporup.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/36184870073.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/83943042517.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/larudipiragaxumogotu.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/21414241595.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caf35777ce---72664188990.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/75670839121.pdfIn PDF document text
    • https://baglab.pl/galeria/file/kitimazafis.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17566362975.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210902095336.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/koxenuzuju.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7e46c8852---wazafeforenig.pdfIn PDF document text
    • http://kahasat.cz/data/file/kevipuvemo.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/52612989717.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/bojojivekinitimol.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210904_041352.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/riwiremonemazuligopifemor.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_off0000c792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC792 18760 bytes
SHA-256: 392700fdec4eed87b2f5afff1e25269899a4327f4b37070d20077460f49fec53
font_01_sfnt_off0000f838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001104f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104F 10256 bytes
SHA-256: 52f52ec7fae2aa5470281a73203105e495d2598506a899164cd93b99fd6ed308