Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f2da95df083c3c…

MALICIOUS

PDF

84.9 KB Created: 2021-07-21 00:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd0de0d8390d960d53b2d8c63c9465cd SHA-1: 491032e76e15c6a78c5f0cd4dd6b89c4a9dec7d4 SHA-256: 11f2da95df083c3c77b97f9d59bcdd4a03c9f24115da7d747e6a358f8aeddd0e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://goldenagegroup.vip/userfiles/file/38152399950.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/0tdjpdb35gfdtovm2hqbmbms8g/xedogivomuzuze.pdf
    • http://cnc-soustruzeni.cz/files/file/1044878393.pdf
    • http://webhenevents.com/clients/868374/File/13669229840.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3860909a0e3f500585adf68bf8ebc337/58517425154.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/63a989d14ca6e6cf21ad469808b75025/bukadoluwasolenemak.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/uc1n0ilkh27s25rjj0ifh4fa0t/dugigesosux.pdf
    • http://absolutelyneon.com/userfiles/file/kokaxadipixuw.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7511eb1865---56848926248.pdf
    • http://eurolocal.info/sites/default/files/images/file/4480549057.pdf
    • http://jrmhandling.nl/upload/file/2366586570.pdf
    • http://g-shocktou.com/user_file/file/pizugulururulosixojo.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/5e7c51d0f90ee1d74d978d46e45d8e5d/porabukuvigokulofefebu.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/4f4ae16e41c4c1197c3499e97504d9c8/28345347288.pdf
    • https://elsa-daulte.com/ckfinder/userfiles/files/ralegojolizevasazasine.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160928d1f549b7---ruzojisafili.pdf
    • http://softwarefactory.nl/images/file/56472272328.pdf
    • http://nuraski.pl/wsg/userfiles/musifebuzapibajifupumiz.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077d13603a2a---sotowujura.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/986b54fa239033428423c6bf1c03e4a4/760001442.pdf
    • http://mevlanaasm.com/resimler/files/jodabasadutatofajafalefo.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c22504c4ee5---88421193031.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=free+water+cement+ratio
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e865.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE865 16792 bytes
font_01_sfnt_off00010077.bin
f14ca226486d29e233454a36c2eacfbe64d8951ba04b3ebbe8c6113c64bc5341
pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 17428 bytes
font_02_sfnt_off00012ded.bin
d9b3a11743a15add89ec035cdea5a54fed97f70387be28e8132367d764d06f67
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DED 10240 bytes