Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e0d6b26239e2b0…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 16:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe9fce6df4b65f0ef583f0213c70d1f6 SHA-1: a347e646adad41ee3f7fa7766090bdb9bea940df SHA-256: 57e0d6b26239e2b05e9746e24cfdc2e734bf553e04727b51da00b7ebac63058c
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, with several pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=8+ball+pool+mod+bani PDF link annotation
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/fopowedatus.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/57042772993.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/tujizibuwetewu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd06c4db4---dojupapibezaw.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/vevewim.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/zutog.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/lefowudu.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/tabab.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/92729008749.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/wujafigelenezoje.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/gumomemivijatedasis.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/c0ca5cfc659dbf5d1ff1615cdd2cb22e/54846626052.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/86667912451.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/57833516463.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/700049917.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/xufutiv.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133cce230b8a---34636339069.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/bawujolupixuluwutaki.pdfIn PDF document text
    • https://strechybenesov.cz/content/nadalukipofavox.pdfIn PDF document text
    • http://baove247.org/upload/files/kezokixoxoz.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/31950901176.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/14548560003.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/makavizivovopofumibexu.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_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 16944 bytes
SHA-256: caf6f7615e08ba532fba1bb4d49f6127f9966802ed066d443dbe5a6ab686b77a
font_01_sfnt_off000106c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 10308 bytes
SHA-256: fa5d5bb2b220af47db266cfdf2e6bd8c880f591482afc58d76705e549d61fefb
font_02_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1