Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4c1ed1eed5601e5…

MALICIOUS

PDF

75.6 KB Created: 2021-09-26 10:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a630cd8d9c1b3897240e6d8e3078cab0 SHA-1: a0d6da7facabe46c29c13640b01cc300798c428a SHA-256: c4c1ed1eed5601e5ecae13f69bad664c911aef15cc72b81f87df54606b6a0ed5
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://elmaga.lt/components/com_mijoshop/opencart/image/data/files/zivojejiziwino.pdf In PDF document text
    • http://crocepadrekolbe.it/userfiles/files/xolebawinoralibumu.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/12119894632.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/42656828656.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/datunulo.pdfIn PDF document text
    • http://recrute.fr/files/files/daruxunakexofaxadima.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/29888827367.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/17601994108.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/24020150174.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/93867966595.pdfIn PDF document text
    • http://tano-cable.com/d/files/42172376657.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/243f47693f947e4837e33e2399918fb4/fulenozoba.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/97782431779.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/xuviwirodo.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/f59u189fcb84jru3a12f7p12l1/66952441083.pdfIn PDF document text
    • http://plusdesignwebsite.com/userfiles/file/gojizo.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161353544449e7---xebetefabodepofili.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/85726896483.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/42196664163.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/77123130402.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/31395554255.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/petozuzoj.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/woviduf.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/60709101643.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/lutakakekixilunutipapuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=menambah+kapasitas+ram+androidPDF 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_off0000be0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD623 10836 bytes
SHA-256: 9b64034f2bc7ab21ce5b8bd176df0a0accab88ca99770aa5e0199f05e7cfb139
font_02_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 19260 bytes
SHA-256: 0d5a476d7632e84e0acead238b9a800c3043204b2783afce0819cb5de4c9081e