Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ecb22b69adae736…

MALICIOUS

PDF

94.0 KB Created: 2021-09-19 09:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0bb16d6e07001c62c95b1648b713f3d6 SHA-1: 54c6d1c17d6b404ac81f206e36c1afa47fafd11d SHA-256: 1ecb22b69adae7365fe2c7e9fa121c857ca27153ba58b4bc95661ad79db754be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://pttaccounting.com/userfiles/files/48035326115.pdf In PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/51996260702.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/869663322.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/warebozariwiv.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/34390164649.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/vurazu.pdfIn PDF document text
    • http://lovesenergy.com/file/19691521509.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/linowunawanimaz.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210907_89C7E3623E9893DD.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142b06816d23---21590929349.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/94219611501.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/nujivunilivoke.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/91650013248.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613561fc5261b---8602057597.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/83376332276.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/15188312743.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/gazegiparoridovifipepug.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/28870110091.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/xilewatape.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137914284acf---26300157880.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/43fc07beb63ed34a985e4849cf7af38b/85531781072.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/41627438254.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f67ef377348389986a830149f22f8ff1/gutapev.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-13/20210913131544442228.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/kibog.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/zalekekoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=song+of+myself+themes+pdfPDF 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_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 18608 bytes
SHA-256: a2f35094454d66329190ad7009ac21b2f8227d30ec5e9c1632f35bb3d878b841
font_01_sfnt_off00013982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13982 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15199 10780 bytes
SHA-256: 3628ec0937fa873ed39b071d5e73e24c6abb305aba1eaa49ca7467329f890849