Malicious PDF — malware analysis report

Static analysis result for SHA-256 181ed96ebc8dce90…

MALICIOUS

PDF

80.9 KB Created: 2021-09-15 22:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53e1f24ecaa4af45d9defbf685e363e4 SHA-1: a1aff99013e4ee1bc4ce950d1613f7467501fe56 SHA-256: 181ed96ebc8dce90ccfb2d877566dddcfb5b244ade277b66e0306f61db929474
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=bible+en+fran%C3%A7ais+pour+android PDF link annotation
    • http://elverum-revmatiker.no/images/file/fokobalexelagogi.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/44600012165.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3a2ce489f62ead59d10d0e29640cd953/78300558738.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/wabepunubefepi.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/cumtoqco9fh0u6fl3nk46je95m/9650203638.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/pisipajiwakawuwevolebe.pdfIn PDF document text
    • http://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/wotinif.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/datexobabimitosomebeda.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/vimuvowelajazeninegeseve.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f694aa07ac---33166120016.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/181455078461334f9eafd46.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/dokatovoj.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/70364655604.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/70891053462.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/f5ehehjbbdtphf2ka80sb8tch7/tawutafujisubido.pdfIn PDF document text
    • https://cooperspick.com/files/vosulu.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614199ffb89f1---99489191480.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/73311726975.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/romokikixakokavemomi.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/metisifop.pdfIn PDF document text
    • https://businesslife.com/content/files/95336334661.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cee870eb3c---wasivumiwatel.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/supadejo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f29c9b3045---52184839959.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/powovanafekimogifuginanu.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/27226319863.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_off0000d33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33C 18796 bytes
SHA-256: 13c2ff966968688f7ef3712437154e673cd27c902e1ce02df3a47561bfcebdcf
font_01_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC4 10884 bytes
SHA-256: 999734b1afc506518b12973b5aa5bd4bc50dec8a6c27becc55e9360832af29f6

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