Malicious PDF — malware analysis report

Static analysis result for SHA-256 caeec29e8e3eadd2…

MALICIOUS

PDF

73.8 KB Created: 2021-09-19 09:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 46d6dd5fb95896df7ea565aa53d717eb SHA-1: a27d7fe2ba8d0d774dcba8bf434f1f6705971f0a SHA-256: caeec29e8e3eadd28bcd12e7f23df6846402e03569ebffdebe74c44bb1b96cca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to various compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to facilitate the download or redirection to malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://teleserviciomalaga.com/ckfinder/userfiles/files/watabugifalepogid.pdf In PDF document text
    • https://fonixkoncert.hu/upload/file/65909896791.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109061131037047.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614021cf76d1d---89962366056.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3ac1f3956f18f204e70978bfd90858df/97222384848.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/15490329215.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/fagalaxubipetikigixatu.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/zujajutikowuzi.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/rikumapemusiwid.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/vusegos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fc1b32c61---15152290172.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613579c77fafe---20008547118.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210908_1F011709B18FEDA0.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/livoregosewowokumopuf.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/zaguvikaxorixori.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/pexudawimozil.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219182338491218.pdfIn PDF document text
    • https://qkon.ca/images/file/70067465744.pdfIn PDF document text
    • https://normec-cm.com/ckfinder/userfiles/files/5249278085.pdfIn PDF document text
    • http://innotack.com/userfiles/files/vifiz.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/72181924019.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/gaminikorowivomivunufuw.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/9257403017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=scan+live22+hack+apkPDF 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_off0000bc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 10340 bytes
SHA-256: 055de64542fa6436753fd1173444a4ab7b6ba26a1ca7efce7b1c39800d06c3c5
font_02_sfnt_off0000eb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB75 18360 bytes
SHA-256: 6140406d6b49882a242afded2c3d12636ab00dcc30a4b6c79188ab85d7854e4b