Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b94bbc3087ef28…

MALICIOUS

PDF

97.6 KB Created: 2021-09-03 02:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9124e6e7ab0ef3b8892c1199d0382c0c SHA-1: d7b6aaef969f4814ae1e6aa6c26b99d71870ccd5 SHA-256: 65b94bbc3087ef281bd96e958cfef05104ccee5d920122e26621c48a4b73f930
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple links on disposable hosting and compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/1bmftl71bsduhmebjgk6tg73ob/ramixoluvilegerujenepaf.pdf In PDF document text
    • https://altonika.pro/files/fck/file/56894016972.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/59eaa415a1db69ed903f65442a20ad92/97197727493.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16102ae5d6d5eb---88646811558.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/83478850353.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/b84f525eadd908493a42cf654824a4a4/25707568511.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093a5b03c5b1---96027044756.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/lapumepexomixapofafusofat.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2f8399705---38331867358.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/xafodirase.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/95668409358.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/lurotasodunitapuru.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/86583993496.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d613a766828---99989398235.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/jjd61lq999cacao2v7ich4moou/pakodamolazoweluramu.pdfIn PDF document text
    • http://dhf-china.com/d/files/tesedozazela.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/vuvuwede.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080275cbbf43---donubewekidoxenejaz.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/fu18jp8lgqjl0qm48qe6pe7313/86915870375.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a045b1283f240a65f8ce44c6c3b96b91/75290158994.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935ed57179a---xuximuviguwelufiridujo.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963a5a4026a---gatawutav.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/mezarafe.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16079ccdd055e6---51991664145.pdfIn PDF document text
    • https://www.disbel.es//ckfinder/userfiles/files/gepumulutabaxebumemiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ford+escape+2004+owners+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_off00011910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11910 10968 bytes
SHA-256: 2fa88c10ca4cc03e22a068af5281a199fd6df1e329b040eedcd697b388e5897f
font_01_sfnt_off0001329a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329A 17596 bytes
SHA-256: a7da0dc9e7a9e86334ebe35b3f9494f8e472e2df339cc3dedbe979c5c2504daf
font_02_sfnt_off00016078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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