Malicious PDF — malware analysis report

Static analysis result for SHA-256 14496496d7fe2236…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 05:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c8ca281f243c7ece931e595e73f8ed37 SHA-1: 5f62ab8ac472d91c688f366900c6d3dcb050732e SHA-256: 14496496d7fe22363e4bebeb96eee8ac7ce89ddec2f8db8cbcabd6c0c942a553
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/2128094820.pdf In PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/69542709550.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/nusasazobotomazo.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f4618600cd6---renitarumiwoxulozo.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/nibenijugubajinokegivak.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/84094527503.pdfIn PDF document text
    • https://guijek.com/userfiles/file/jowedefutiwobarobo.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/26632684754.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/bd95292d740976dab0320961252b0323.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210704054936_jow85m.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/92739781606.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/sutotejogerigajobekavab.pdfIn PDF document text
    • http://geodez.com/pliki/file/11443351759.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/1d57t4sfimkkafvsilf5l7grq1/lovalijenozi.pdfIn PDF document text
    • http://jinxinghotel.com/uploads/files/modijisapixorepegawepasi.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/xiwofobitapewuw.pdfIn PDF document text
    • http://gibisch.org/files/files/nejituxefin.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bc66e167b75---23544974974.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3b068d914---kowegitutumodol.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/97627859414.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/54788681470.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/zezipapolarupikoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=assessment+in+meaningPDF 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_off0000d8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 10164 bytes
SHA-256: 4571567386ba00891f1824834d17eb3d59d21301deb9e09945049016947b4e2f
font_01_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 18248 bytes
SHA-256: 57aa3aaf75cb5759c817114b48ef4e21bb67f85f24815791b77f8daadb30af7d