Malicious PDF — malware analysis report

Static analysis result for SHA-256 5727070f86032f33…

MALICIOUS

PDF

69.8 KB Created: 2021-09-09 12:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 11f6df1fb20e906cc25ac9afff2ae586 SHA-1: ed252c3b61a42af8c0dacc20b8ec32c4a9c7ae87 SHA-256: 5727070f86032f33c93d06550df22dcb412c0c5b97e47f8c59b4514ba0605d49
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to multiple external domains, some of which are hosted on compromised CMS upload storage. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bensonlandscape.com/editorData/file/didun.pdf In PDF document text
    • https://ppntassone.it/dati/upload/file/kesedev.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaa634a0d7---17170247750.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210908035159.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/30972301431.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109031023049835.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1dcf0d741b6bfc1fb2b281ebe52c435a/9070744249.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/wosenekeduxopefejilusofu.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/87915988839.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/molikaj.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/16772486808.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/fuporijodo.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/92059671344.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613825947a48d---rugodegebanoburijagogula.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613340cf5f82b---76454962962.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/xifosavonexus.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/22060962392.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c2593d7d866bc27c3ae98b5f62d7595b/gugiwirunifesef.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137c0df8183f---xawezalizugad.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210906005121797.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/femofoses.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/7ff9f7b2996b56abd2e75a78c8110eac/xukejavumuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=minecraft+pe+latest+apkPDF 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_off0000b27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27B 15608 bytes
SHA-256: eeb18df783a2b72e1e71c84df75e649d2cbdccdd20d1f2717589ea069749cdec
font_01_sfnt_off0000da13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA13 10436 bytes
SHA-256: 800c55a230a63ae6377cb8587fc86a65f9ff45fa2584b76bd24647cd2bd793ba
font_02_sfnt_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1