Malicious PDF — malware analysis report

Static analysis result for SHA-256 122a5d31a787e43a…

MALICIOUS

PDF

106.3 KB Created: 2021-07-25 00:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ddc02d7f5de41aded272fe9e2d048da SHA-1: ece84bca5e10e495c9d03530dbb068267b78d480 SHA-256: 122a5d31a787e43aee48d9966fc27fcc496bcb00d3b38a4f0d52a1a7f42271ef
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 upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://myshopekerala.com/userfiles/file/84714127887.pdf In PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b57a1ceae7a---53526293955.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/refidemanusuziz.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/k8i06vup596e5kn8eee2me25nb/34965661839.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cdbf6bcf8---85599799224.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/kanegemakenere.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/53008782317.pdfIn PDF document text
    • http://bienbao.net/uploads/files/30371017208.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160784815bff31---dafimaxatudowasum.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160f1b8ce07715---nobedavukojosuxuxow.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5012daa916---79980472096.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/bafadanunu.pdfIn PDF document text
    • http://wenxuezj.com/images/File/bolaxukagukijawules.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021062012132380554.pdfIn PDF document text
    • http://silverleafspa.ca/clients/10619/File/56884443428.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/d9dlvspc5qlubfh6np06siruj2/tawoboxudodidevotedo.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/6382992140.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/dowotopumigidajazigaxi.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/sotusixufekofaret.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/4618394108.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/nalezoparapelazezemebuj.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd00811d0a---dajoki.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089a685d1fa7---jubavasese.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/xajinepa.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16075f0f62ce70---voselepixapikebuxuzake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+does+solar+energy+work+step+by+stepPDF 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_off00013d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D65 17524 bytes
SHA-256: 7bfe65c61e7601db6e25e8b9ce816beef69c7678f602fd9fc66a84e964b27088
font_01_sfnt_off00016a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001824e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1824E 10900 bytes
SHA-256: 623be09ee0e15cc09f40d5a026fc3f3acac6e240ea6c7fc54fb55f7d79cda2cf