Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7258c91ce49a675…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 02:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fbaf4b4d43480643e8af792cf0455340 SHA-1: f9a361eb0f54a1265905d4394b3aa75c28ecfa68 SHA-256: f7258c91ce49a67557c2b707a08f78fe0bee33cd4a47ecdd8d32b01a3dbc05d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous disposable domains and compromised CMS uploads, suggesting an attempt to redirect users to phishing or malware hosting sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/65161229300.pdf In PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/nevujusexirobevav.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/770efaa91f2abbc4f3e63ebbe806d68b/medaxoremizej.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/bonogakupukamukupo.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/wijabubabewuginabujoduzet.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051608003573499.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/tusurikixufina.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/n9sb116inhnpdtvd0130dl5l2c/3180133134.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/mefimawadaziripeguvujit.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/zozameja.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/wiviridovovuv.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/feeedb3f45e9c81201262b5b140a51e3/vagusa.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ec61f710ed45911e8c05437ed409493b/15309075091.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/gazuvu.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/metegebeg.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084244dd4cce---80012468718.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/kagogan.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/92226251842.pdfIn PDF document text
    • http://praguetransfer.com/files/file/kofinonufedukumodisobabit.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3a882d8857655202790429508c854e83/zusixuxodopixa.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210627195320.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/405f1f6bff0ce0ee77b827f59caaee74/92223913905.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/92d14284a50ae5ab817222850a229832/murulul.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210825_EC3EE5051CAF7F6E.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=manualidades+con+papel+crepe+facilesPDF 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_off0000d666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD666 10608 bytes
SHA-256: 81ede90b4e139696ea07fe6540a87a6523ff71da2223492fd0deac1b3c66d1c4
font_01_sfnt_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BF 17636 bytes
SHA-256: 8ca6d54134f66250f4ac8d4cf3431b253c3140b31107aba06bd01b3118b1472d

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