Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ce7fc662ea5b4a…

MALICIOUS

PDF

90.1 KB Created: 2021-07-06 02:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18697de6f2d8378638c94cbb3a414f81 SHA-1: 300f27fdd553806cffc07bcb4cc264cf4584a660 SHA-256: e3ce7fc662ea5b4a6b47ed9b714a3dc1c3391747569d1933a03c599219674b33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the PDF acts as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to redirect users to malicious sites, hence the inclusion of T1059.007. The primary attack pattern is likely spearphishing attachment (T1566.001) given the PDF format.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/aa4eeb156f7caa0c45c1b0490bd66bcd/binivalulixalipipu.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/xapikuwiz.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/7f892ce75b4723c2214bfa65464e42e0/sexejevuxefedetirurovex.pdf
    • http://cobansut.com/userfiles/file/67547820579.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/6611ddf9f27a7ddfb56d39e39539224f/59861115343.pdf
    • http://siembra.me/uploads/files/167066049.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/70b1a6c528f5440ba25380d31a9cfc40/99822474551.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/0073413f2c6a9cf5d33b9de02d3eb276/51947836326.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160778977770bd---82699903844.pdf
    • http://jnnycc.org/userfiles/file/62812782895.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ncb9bqdm1pb6jp6no8c9jc6gq5/14290946190.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdb63598dd---tenosemikatesibexi.pdf
    • https://alakharia.com/public_html/userfiles/file/kunukuzititugav.pdf
    • http://yesilderecine.com/admin/editor_resim/file/60376771266.pdf
    • http://cedule-plachty.cz/files/file/tudomojidesuwekujedenewu.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/16eb20c25dd254797740aa2899246f72/tubareboj.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7dub7urcte85iia2rdu7n1b5n1/14459186884.pdf
    • http://sun-green.nl/ckfinder/userfiles/files/gijukamed.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094a6d79f4d6---24559142716.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/5a95b9bf5468f1f43e0840555f3a5c83/zanutidirinezalelebadun.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c73d6c4dd3d---kanawiwakawe.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b600ac8e7c69bc1f3c799cd3c7c5fdf2/55337117551.pdf
    • https://xanbiente.de/userfiles/file/xutubetufojuwini.pdf
    • http://stalmost.pl/userfiles/file/65368833174.pdf
    • https://iwanbim.com/userfiles/files/zasorameriberegujox.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dccc1be196---soxaj.pdf
    • http://rilta.net/userfiles/files/rudanaxuxifofuzat.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9a577ce4a---befaxipajamarup.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+rithmatist+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_off0000ffec.bin
7dbe8a45eab9f544e23574fbad2ecc1e2135872abe2bde87bc71af32f8481094		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 10456 bytes
font_01_sfnt_off000117a8.bin
b114e106d5db6b051e58a82fb8f3cf24f10f6dd24046db399794499273530522		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117A8 16780 bytes
font_02_sfnt_off00014313.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14313 16792 bytes

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