Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ec23b08a9f1472…

MALICIOUS

PDF

81.2 KB Created: 2021-09-13 17:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2b9fe131ea040c9d52d8c5b2aa7e58c5 SHA-1: 65d364683f1d0ad85d87e437fa1ce32a82ca2e20 SHA-256: a8ec23b08a9f1472800dadc47feba44ec3bd97bd487ed8b446b9c1efcdd5ea30
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://redac.ch/upload/kukojerijef.pdf In PDF document text
    • http://americandeliorder.com/uploads/files/vevoxeda.pdfIn PDF document text
    • https://estoniapools.com/contents/files/nosapozexuwoxopuponono.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/vuwigakotixoli.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/vegafazi.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b98cd0fc5---rirawadukujevivomane.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/85625608784.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/xepuko.pdfIn PDF document text
    • http://tavio.su/files/file/98463521133.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/riwimunutiwididokedo.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/82394061755.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/gokizusizadofave.pdfIn PDF document text
    • http://kadet-ck.cz/pic/file/77669626341.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/tomewagotalo.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/zesokazuxajepovad.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/dunuma.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/jabuvimogexagi.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/jelirigaxaxe.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161306c82100db---jegiraxotekel.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/xopinekonon.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/35785697339.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/44d3dedf8445de2e6f25be318ef2501b/71706093511.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1087bd6f---lovovifinuvafu.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/vejewizusipaxuwipomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=windows+10+pro+x32PDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/73041921604.pdfIn PDF document text
    • 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_off0000d616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD616 19488 bytes
SHA-256: 538650918294c7a5c8c080832eed970e28290ffe181ad3df5649af4e8e7bab40
font_01_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 10596 bytes
SHA-256: 12e8e48d85d73c157b05be499fd935e5c9dcdb24d497848c6861eec73446a063
font_02_sfnt_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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