Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fad44c8a2adfa56…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 16:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9674cffe8ffa64e71e96e428cd24a5b4 SHA-1: 74f562776f636d38ca8f82fc595e1d9b16e47ff7 SHA-256: 4fad44c8a2adfa56e1115df0ebbd02bbaa13869ea4a7da7ae93e08dd178596d8
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to disposable hosting or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple suspicious URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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 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://nomylo.ru/uplcv?utm_term=call+recorder+apk+pro+download PDF link annotation
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613728b9e0a25---10033706726.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/bewizu.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/lejaxikowegubuvudat.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/b813k9mgls9qrnkt558njc4dd4/51230622233.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/sadovosojarufigaj.pdfIn PDF document text
    • https://satesayap.com/contents/files/liseledajusi.pdfIn PDF document text
    • https://gadapavimenti.com/GadaFiles/file/kolakitawadekuranopuv.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/wuvijofemimidivitujip.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/dalubabiju.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/34567375619.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/bsg12kpoqhn1c425rsq0h3j865/69701491973.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/26577186068.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/tosemojuvoxemovikana.pdfIn PDF document text
    • https://stvorki.ru/files/file/zenakeserijusoxemer.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/supuvu.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/7ecc92dc9186fae84c129378f1ac6108/6910898003.pdfIn PDF document text
    • http://mobiliteit.nu/files/jefagidovalipabadof.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/sujazoxifuvesox.pdfIn PDF document text
    • http://preiss.at/upload_files/files/6942913445.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/89211395121.pdfIn PDF document text
    • https://wrd13.com/force/file/tolukozubimunedovezidekis.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/75098312796.pdfIn PDF document text
    • http://iscelenie.info/files/file/sikuzijutetapumefuf.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613985f9265c1---sukujadalewokopagotimupib.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_off0000dbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDC 17252 bytes
SHA-256: 7f42b5a861b59980616e23d8e97d17d24ea5290496b0a264b4df0de7e7be13fc
font_01_sfnt_off00010879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12090 10360 bytes
SHA-256: d38a5cb58414cf2ef549ee7440b4aac625e926410300036e8fa801ffffcfab7a