Malicious PDF — malware analysis report

Static analysis result for SHA-256 311b3097a36354bc…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 07:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 119b971eb1e9de61dfce64b966718d59 SHA-1: 3ac1dcbeea455a1619a29c2c1f158b00d98a0c87 SHA-256: 311b3097a36354bc15e0e749c5034184bac7bcf3b4964b032f24d7aaa1da982b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to distribute traffic or potentially host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://geniuschulatutor.com/userfiles/files/12825320661.pdf In PDF document text
    • https://driftwoodcc.com/userfiles/files/91430714936.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/42579629783.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/518521d648758187ebc378a871c04b6e/jugobup.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/rawizuxatuvej.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/33660233601.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/4rk4cpoacptrbunso7s3uj8rv6/wisomuzivajosofivovumid.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/jegazukafabixitajomepuzap.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/5820888015.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/56744049739.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/julimafiwivenabati.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0d824cff5---32966314131.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/f59bc6abd83ecf4cb242cb26bafb7194/fuxofumifi.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/312145036610.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/fc50b3a507df25127ffed923dbda90d7/wukafolowitewonesojatufu.pdfIn PDF document text
    • http://bptramptour.pl/files/file/pepixebubejoxalak.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/bapixifoporenoguxad.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/88915730883.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160894ae7bad2c---999003928.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16083b09d2370e---fumif.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b2e5bbc40f5114ae9f4b8181d9801969/fotovo.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/22537989298.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/domakurifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fall+2020+commencementPDF link annotation
    • 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_off0000da40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 18028 bytes
SHA-256: 0056e2f353ab94009cacbe09656d49394f2dd8910f0e8bbfaf293c98de809969
font_01_sfnt_off00010914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001212b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212B 10248 bytes
SHA-256: 857efe63cb94b8446de6930777bc9c97a18e9d52d13e005c421854c646eec933

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