Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8abb4818c110c6…

MALICIOUS

PDF

88.2 KB Created: 2021-07-12 17:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98ca62152377f30d2fbfe5eed204339f SHA-1: a013e86ec749964b69816c4c2d8077743f3b059b SHA-256: 8c8abb4818c110c6a392a98534214e6f964b211a42c3c3f3ec0d30e115af7f76
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to external, potentially malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://sahodayabbsr.com/test/fckeditor/file/81762771753.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078557fac6a8---97639910944.pdf
    • http://mwflower.com/upimagesfile///39155398778.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b6d47f895---fozegolaxelena.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/51ffffa4e28e15dbe9a19117b3aa31ad/bupupudutupof.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/fisisofinawukatetebowuvu.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a63a79ced---tufenuw.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a84ebff4cb05f60bc013ec6772153c31/94288017781.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6d19b8c7---wujamisufuluxopi.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d3e2199c2---12518586760.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37f7ecf15---14834042975.pdf
    • http://bethtikvahevents.ca/clients/2/20/20a91c0cb94b02964b0d1c5d980f1596/File/veporejemumuzep.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae4487ef81---devosuditok.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cec20d5789---31951646449.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3907837bb6---84586677316.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5m26vlkqakc8uda3a5v68nvjsb/46308898431.pdf
    • http://tunglamgarden.com/images/fck/file/77645880206.pdf
    • http://starsunited.at/upload/files/41455618672.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c852588e188---fixujegawoxate.pdf
    • http://bukhatirhomes.com/userfiles/file/mexomefowabebisefuzix.pdf
    • https://zemiigori.com/uploads/file/1293773116.pdf
    • http://www.elstar.ru/uploads/files/83878654198.pdf
    • http://darstin.com/userfiles/files/dajaxapuzozupiwe.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0768ce77b3---jebawamagalagoz.pdf
    • https://bawwabatrizq.com/userfiles/file/32056734833.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160951fcf1f60c---65099765699.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=associative+property+with+example
    • http://medlab.webd.pl/upload/file/88679199766.pdf
    • 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_off0000f0fe.bin
4d0b0682556b4e955a1201ec880c03bf3dd67a477cd2cdd9cf2b25aea124fd7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 18184 bytes
font_01_sfnt_off00012176.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12176 16792 bytes
font_02_sfnt_off0001398d.bin
1e2177b8526573746d075a680092bef5616383d52256bef583891ff7d843e1a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1398D 10884 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.