Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a33629303e2a4f0…

MALICIOUS

PDF

111.0 KB Created: 2021-06-30 11:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 111d3dd575b45d4827509375857eca05 SHA-1: 191f409c352795b6382871bdaa3692675b5601e9 SHA-256: 2a33629303e2a4f0d37cbf22fef8fc812fc6f610dc6bbe45216ac0ed95ef1032
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The file's structure and numerous external links suggest it is intended to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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 https://manuscripthandler.com/userfiles/file/waxusa.pdf
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/datuxakixazaderu.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/zenemisebotexuvu.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bdb02fbf7---luvadomok.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087db85e072d---lifisulusejezewaludufu.pdf
    • http://langfordfinancialservices.com/userfiles/files/39753441416.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078898dbf402---27121713930.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14e57ad541---dowaxuwenofuwilugefezifi.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2c9b63023---fojekamem.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/3dbb0429eb1f01687a95ffb4a38a625e/soturek.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7c3e0ac27---dudefupumulaset.pdf
    • http://utuin.net/files/fckeditor/file/82155374051.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095cb603b75f---wemigona.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099ba0c46442---24766317536.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f823b58518---84576470980.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b1ab11cea---vifuxezuzegokosupifariwa.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0d2921f78---rojewubigebizetotamojog.pdf
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/45109919159.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16089a9df6182e---sunefopesilavu.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/160a2011ac7d9a6a03995367efb22d77/xexidareriwitefa.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b49278af2c---83662214064.pdf
    • http://notarbrazda.cz/userfiles/file/84686410720.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f55c5b2476---zepofinub.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074915ea6cbb---60243893761.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160717b29f319f---fepizaweropes.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=managers+can+you+hear+me+now+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_off00014c66.bin
a9c30f8400a44c89729457d99395a6fce1913309b406ecaaef40a866f7ec4ae9
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C66 18288 bytes
font_01_sfnt_off00017b50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17B50 16792 bytes
font_02_sfnt_off00019367.bin
c1c3cf57131b4693c8b6b45600e5a359ca5e7ea0c4424fe7818fc632fb62c92a
pdf-font-stream PDF embedded font (sfnt) at offset 0x19367 11124 bytes