Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cb80af896ba7e0…

MALICIOUS

PDF

78.7 KB Created: 2021-07-10 09:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f754eaf77563a0802d5bc3695370ade6 SHA-1: 14764b13c813625ad7fa9b5153e2fc759f30446a SHA-256: 13cb80af896ba7e094b8a7b603612ccd49beb51625f3e2f2e9fd408d7b2bd3f9
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://crackershrimp.com/file_media/file_image/file/26291204509.pdf
    • https://ancoraeducacion.com/images/nopabukezomadejabal.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16087aa57081b7---zisibadonaxuvepapava.pdf
    • http://skolicka.eu/foto/images/file/76831234940.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/086f3311c66dd2dc2043bdab7b50ff84/49575187708.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9efd24b2f---98119783623.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/fe599e3fb2bdb4c6b4131bef0b69ae33/5212129559.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a301f943455---49884329529.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ca5d15574---11871875814.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/5b69a3c3573f64fa75d990a16371742b/30771000365.pdf
    • https://acronimocostanzo.com/userfiles/file/lebuzajower.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07e7bc575e---96751654721.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5972d1ad0247432c5947ab9151bae685/sunixubirok.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080d4e35f913---25046838039.pdf
    • https://malashealthcare.com/userfiles/files/63278081228.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/diosed0pnurnuugvaec54fackr/xazujon.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091116b6dea3---kulebivupudizesupu.pdf
    • http://bright-mineral.com/uploadfile/file/2021061722184195.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/7921671203.pdf
    • https://vatlieutaphu.com/upload/files/wejuserinafunuwabujovepo.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ajr2sbmpdbgu6fi29q7hogoi6r/wolat.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092281903f02---24569133769.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/umobth1h1cb097r9g1hvvjlacu/56882336632.pdf
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/sefebotatatepapow.pdf
    • https://parklanehotel.asia/userfiles/file/getivimuzajom.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082a100df30f---gunupomufewisinifigizi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=canon+in+d+simple+piano+notes
    • http://e1pl2.nazwa.pl/busy/fotki/file/sorasevexosu.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_off0000ce6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6C 16792 bytes
font_01_sfnt_off0000e67e.bin
66c7045b30de4e4cfadc13274a56bfcabcdc076256d5c228cc65206aa6340296		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE67E 17528 bytes
font_02_sfnt_off000113d6.bin
931a51f6ebcbe10624909803de7e38d5be2aabfd4908f92568fa207dbbf23deb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113D6 10484 bytes

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