Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a253233123c4d04…

MALICIOUS

PDF

87.5 KB Created: 2021-09-04 14:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5c29e664e6807b946ab6e5e5f3a68e49 SHA-1: 24a4e0647e41fe0629a1660bb068cb4f352f8b37 SHA-256: 3a253233123c4d04a4372d9d6049e62781b2957b256fa4cdbbd069732c405d50
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs suggest a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160704dbc9dfb9---26043694018.pdf In PDF document text
    • http://thetestmag.com/userfiles/files/51789812152.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076895219163---nafos.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/86440860347.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/gorokupab.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b8f6cd43---83748779311.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/023ea2f83aecac0b0c40817148c6681a/bomenaborul.pdfIn PDF document text
    • http://araonline.hu/uploads/file/67640577661.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077335fde929---rinatonejajasenoviz.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/50424781620.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807c7b23a2b---3445103138.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/pexanopi.pdfIn PDF document text
    • http://drive4smilesquebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/kadesuzugidepe.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/129da08808a65de65c4814e9bcaf0913/96197282765.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/16928007268.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/74503572034.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/58129010421.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/56687665609.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/lakomimuwitagabonuk.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/64254017324.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160a407ee3e741---94870019722.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f721f60349---8762743213.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/nofodomuxadofezukojuw.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/e6e125ce6cb02dab8969f8b08ec7200f/378232085.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/gabeditise.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/sudurag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=xpander+2019+manualPDF 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_off0000eb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 10644 bytes
SHA-256: db4fec4220c8526dc281c70af16a7aa71351d090edaac15252708e4885395be8
font_01_sfnt_off0001039a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039A 20708 bytes
SHA-256: bf3e7b7e4d141faa24662e0cb4331a4aeb2eb56259c0efbefc1c22bd9f2717d4
font_02_sfnt_off00013817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1