Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88af017a8488a6d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 02:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 739edd9feb2382671b4aa1921299373e SHA-1: a1bcdd067b65f2891b9268933306d7d24c53eb9b SHA-256: d88af017a8488a6d150567cc49ef404e36e63a8d1cd12024586b62c65b99a96f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, distributing links across numerous compromised websites and disposable hosting domains, likely to lure users to malicious content. The presence of embedded URLs and the heuristic firings strongly suggest an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=taboo+playing+cards+pdf PDF link annotation
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc052b2ffa---wifawovufujorulu.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/61466087405.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16074494607088---dipirajodilepa.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/50556487854.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/luvunubifiwanodasi.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ui0eivs8hsug5dot43n1ndcv4j/zerepiruvuvidi.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/8ac924372747d49c33ca139b54a89284/wiwazizovevuxesitasubilu.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/880b498c94b9f0efb11b1724a2303b27/jarijalokoludaziw.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/65701887052.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/damenadiwikuwa.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/3dbe249d7dceac58f03ae71aed76460c/51294221210.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/wegezotaregom.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/levudunajinovonoj.pdfIn PDF document text
    • https://altaspin.com/calisma2/files/uploads/15479999521.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/74493860139.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/g1ca0srqvhj0dmhobjfrhjgdo9/57559109886.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/v622r5s8hca20h7d1eghfn9ce4/82514969684.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/93000313497.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/750dce1eb55b06440be2509f1ad86ad1/parez.pdfIn PDF document text
    • http://xenangheli.vn/public/files/37156227066.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/gajirixaloxozakotoxivi.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/tamuw.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/wowusatijodojij.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/e560717141f89b903108afefb7ea630f/59566187016.pdfIn PDF document text
    • 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_off0000dd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 17696 bytes
SHA-256: 32726f9ed20e5dfef23c88799c31d3c05b0ad09c1822467a7de655bd94fd6d20
font_02_sfnt_off00012323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12323 10780 bytes
SHA-256: 3edd5175b91d68ace6954e0a2dbc04bd75d8e2d80d7e2e9e855cda917827433d

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