Malicious PDF — malware analysis report

Static analysis result for SHA-256 53fec08e26bd864c…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 19:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13061fe95a2e606996c3d472bf0c1dd9 SHA-1: d1dbb838d9223c367f63d9592eb83ea7d2bc71c3 SHA-256: 53fec08e26bd864c8e26c449709821ce49c80951909c7db3d175ad882a97f864
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs, many pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF's structure and the presence of multiple unknown URLs indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d86e4e085---65261149467.pdf In PDF document text
    • http://lovesushiscv.com/uploads/files/27003453941.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/64470454840.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/55398104549.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/jagururujidibajetutolobaz.pdfIn PDF document text
    • http://khocabien.com/uploads/files/vidujemalisejoji.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/40404209213.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/vidibadux.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613065f97f809---75274175086.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/43374133869.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/pavigozuzaponenogonig.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/gosukoxiburoxewepuwib.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/jirugonekuvedoxirone.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/49915807332.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/somunisoguxivamotetuso.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/15484170356.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/1679999096.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/kupimufofudixalatun.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/eahjb2m346br6ik9a1q8ibvk92/69090862403.pdfIn PDF document text
    • http://mamitobe.ru/files/file/zomusemafomarewamaj.pdfIn PDF document text
    • http://eko-uklid.com/files/file/69866779001.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/77388789942.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/13594074375.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/veborugubujuvozobikoxedup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=unlimited+coins+snack+videoPDF 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_off0000c2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B8 10596 bytes
SHA-256: 5dd689138653fc30a96bf45c7f161bc31c5dc0bbd185909c68bdf3821868c0bf
font_01_sfnt_off0000dae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 19844 bytes
SHA-256: 435f4253b71847cdcc2d179f47222042b36a64382be4d2d726434b93ccbbb1ff