Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0346751ec2c6e80…

MALICIOUS

PDF

113.5 KB Created: 2021-09-01 10:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 235c09bde3694d8b686cb1ae92b69df5 SHA-1: 5514d174298c40e3e7adda7995c4a45aa093f354 SHA-256: e0346751ec2c6e80e21589d8d2f038e0ffce61e00e4f99be3c2b368418a00d9c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to lead victims to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8fb9781c52824590e26f1cb3e3e5f9c3/fukowilulumuw.pdf In PDF document text
    • https://condicionamentofisico.com/arquivos/file/luvip.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f3e7bf889755848b7940d0481e186174/11040755981.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/vebejusopijuloxatedelaz.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/25069301911.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/58284691903.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91925efd50---9827095382.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ff4147361d9---jiwupek.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4595abb40f---14577749601.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/lasipebezedizurawaz.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/7680618554.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3dadaf4b---welikelidexijoxixita.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/eb1fdba9bd2292d36a6ac43d128282d4/merifabe.pdfIn PDF document text
    • http://computerdoki.hu/user/file/96952356288.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/45ead3b8729b062ef1e38b3d844c7a49/34016001699.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/wixolivezig.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/nisisaxojulidurilolaz.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/75375212051.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b14161d16---85962915782.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/fimexawekamalaboz.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/7832801c0aa9f3060c3d843c738d33e3/pupelatiwizogelodofatura.pdfIn PDF document text
    • http://derma-dts.de/files/file/kavoboba.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075869b29cee---37684610810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=lisboa+hotel+from+the+streets+of+macauPDF 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_off0001570a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1570A 18732 bytes
SHA-256: 29387f8b60faa3e7669a049b830b5f66f8c39a168db0c480aabae347ce54dd9e
font_01_sfnt_off000187ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FC3 10692 bytes
SHA-256: 517c73e2bd2ba75ebf4a51f0f27e5f3c0c4c3d44a0bddf886559a92ed30a936b

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