Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbfc674b5943c4c…

MALICIOUS

PDF

85.5 KB Created: 2021-09-24 05:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f98e6ac5cfe17bdc0d877122a3dd518c SHA-1: edd16e2d988c746afc71f165172f6318f2864551 SHA-256: ebbfc674b5943c4cc66a88fa6fe0e1a41f49651f86d8ada522419d072411f9ad
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms points towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=do+not+disturb+on+android+phone PDF link annotation
    • https://coastalstudio.com/images/main/file/gurokosopuzelare.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/gewazivetunufesatefuxona.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/sokobumuxiwem.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/tepofifu.pdfIn PDF document text
    • https://seikai.jp/free_images/files/susevopevebejijiti.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b556eaa222---91328852189.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/gemuvuvimewes.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/vavaxidujakitivabow.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2341ca84d---59565525403.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/pokunekelugok.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/buluvipapijez.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/tofajaxirolakaxare.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/vovoravojemun.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/sovalenidiji.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fhbnkucbjpb1u3kg168bce7g77/88931459885.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/54367294261.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/gefobejoxabutusekuki.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/66449299360.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109132305503071.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148858371922---roparusurumadugovunol.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210922164659.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/95313948617.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/nafaxoxajuwuv.pdfIn PDF document text
    • 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_off0000e98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98C 17860 bytes
SHA-256: a25ea8acfb00cdad5f3564b55a1e2da50e58f4b9d28d60b99637721a75690229
font_01_sfnt_off00011804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11804 10684 bytes
SHA-256: 87f35378601727228170bfaec2c312f389eff814eca7c9f79dafd535b24be724
font_02_sfnt_off0001303f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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