Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a1fa8b1d3426e96…

MALICIOUS

PDF

82.1 KB Created: 2021-09-22 10:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ade68e9735e921efaf9f1b0d66f7dfd0 SHA-1: 62636521017719f6966ca26e34a80f02cc2e1b8c SHA-256: 7a1fa8b1d3426e96f40b940ec2ab0186f638f87b21030e9566fbeeb6649395ef
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious or unwanted software download sites. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://drafthe.ru/uplcv?utm_term=yowhatsapp+latest+version+download+2021 PDF link annotation
    • http://diskacme.dk/images/upload/file/65843841132.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/3929568010.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/30056608637.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/nisorodamomowek.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/vununatut.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147f36782b02---betekafujasuke.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/17807337503.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/12600447923.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/dfd2d94b8fc740ba84db173b1eab27b6/90490686494.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/xakenawosisifisonuxomoti.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/fc20cedb18fb497c02893d359458f6dc/12690304442.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c2c77e866808702a5a2240d543dfa8ea/boxodolalezejebakev.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/85971396677.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/65404190852.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/dinotamutufafidapufefuwa.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/86a9526f36919b7367ec3e3edf17a1f8/jutofaliwig.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-14/20210914080355223908.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/14573018193.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/bamaxozozovafegufapopaso.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/remagabodezozotigizupe.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/videmirovanajusebuvep.pdfIn PDF document text
    • http://planetamama.ru/files/file/fuxerelevud.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/d0af8cfda30b876b25b6e1798096e290/nadirilozazojasanivuti.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/libupifa.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_off0000d92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 18484 bytes
SHA-256: 5400ac290348cc7dd5de912d741ad8c984e65c6dd80b512042157913c9c143ee
font_02_sfnt_off00012133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12133 10920 bytes
SHA-256: 961b9fb65f1b85d639ec4559527752dbccfa9764b4aa3c9d6377b1001fd1325a

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