Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec76582129251ea…

MALICIOUS

PDF

89.1 KB Created: 2021-07-04 05:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6f0d2bb06127ca4f8a7676b645df9099 SHA-1: 2932e069839b77c89ff28b48b220c1d821081708 SHA-256: eec76582129251eae985e43764ed7dfbadea888c3e947a127599723a6277f3b5
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 of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate this is a link farm designed to leverage compromised infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7066385386be6925b1440eaf8815e7a1/86987967798.pdf In PDF document text
    • http://haki.vn/uploads/files/xodawof.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/32f8cab7c063c393a44e3273e1d38417/tofelajofat.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/xekajipati.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/zagejajoradonegusikuvan.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dc9b26eac---42119154706.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae816ca4b---papaxukip.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ejpvjcp0f99d38vhr20ksd7emc/dubaputi.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbca6eb224e---sefowixifivubavuzu.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/92096478887.pdfIn PDF document text
    • http://minipit.com/data/files/83163360154.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/68263209783.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/6dc0ccc14a7d81e051e5d9ab1c17a58c/2662649258.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/mitusaduxi.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1cd620966382527eb49b4cd2c7b0a7fb/ravoda.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/74875553917.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086afaaa3cdc---20339512387.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bd301668fb8---58888611732.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/tixosameduv.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d5e841f5a---mabogisorujofowefunafi.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/vabozesivupumetalor.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744d1a19d39---giregorilaxogumera.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160abc936bdbaf---17870038993.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/delavasekikojofagojij.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///dagiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=corn+salad+with+mayo+and+sour+creamPDF 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_off0000f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 10964 bytes
SHA-256: 1cf324fdba11731d3cd1f4acbddf4040e1cf61a7f757f6b8207607872bc2d9d4
font_01_sfnt_off00010f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F13 18140 bytes
SHA-256: d16abf04079d4c30b9327486d8e08bf08eb0a333f2a38b1635357609566fbd56
font_02_sfnt_off00013ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1