Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9430f4fbf9976a…

MALICIOUS

PDF

115.9 KB Created: 2021-07-08 02:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d5ce713070f7a6ce9bdef5d4f316c9bd SHA-1: d5a0fd6844c30ff3ebbcb4d98655c2917a73c3ce SHA-256: aa9430f4fbf9976ab9a9fe177cd2a0f2385391dc5c063b978e7f7b61b80650fe
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating an attempt to obscure the ultimate destination. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of numerous external URIs and the link farm structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://butterfly-propertymanagement.com/userfiles/file/xumijovalawulivevisilav.pdf In PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0758c34b4e---kaboputiwodevuxobuvalel.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/98613168343.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f6aeec972---feriz.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/7c1da1aff36f4344139cda12ae000aef/pizekakazinoxojitevusijuw.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/bikipemomasirutibeb.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/vi4phhn7fj812qujpvhcrm2648/gajidoreju.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/95214252318.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc72425b2a4---14170862383.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/dujugitagaravaratun.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2693fe19e67bd684fddd79811c10b56b/naxesuvis.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609649922ce7b---53528599582.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/dekexaz.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091de139b849---78510737661.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f02485f2---sugeji.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/g2chh2q8r4ns1c23ql0dd4umb6/fovegugajupokivugekizet.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160810e3316c00---72712885966.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bb32da6ee---50405362602.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/eb45ee921e867884452b6c200cc61bdd/81482296398.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/70346048972.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/xepevaloji.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/63695105707.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6657b8039---45145870537.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/83087732918.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160857cc64bb58---dewolabakatenupug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+book+of+judas+in+the+biblePDF 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_off00015fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FBA 18684 bytes
SHA-256: 94780c02a1b5ae9075ac03278467da003e245a440313c82d4476d5e04dd2a496
font_01_sfnt_off00018fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7EF 10776 bytes
SHA-256: 18ba1502167a02bae387e736d0ee0269aeeb58298d083021d37005c0ab044bc9