Malicious PDF — malware analysis report

Static analysis result for SHA-256 989cf36cd3e33518…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 01:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8200f5c018d17f95c9d349a757bf80e2 SHA-1: be00d5744b5dc2a289b48748a329cf986c581894 SHA-256: 989cf36cd3e33518782118dfd1a770f318f001106a6f31ec3d58460af2a0a296
164 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and embedded URLs point to a malicious workflow designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/a6923ae96a411bbd7565f5afbe605768/mepifiwinowarasugovupu.pdf In PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba432d8d0---22181945525.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/63337014673.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b665869026---ginapowuloxizate.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/5165680754.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/tiranafozikeribejar.pdfIn PDF document text
    • http://millecolori.it/images/file/dedixemasagikeza.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/38803037860.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/nupejov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607058775f8b0---rewasegorazoviwavelov.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/vobev.pdfIn PDF document text
    • http://arlingtonhigh1960.com/clients/881088/File/pojojikema.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098baca1c0ad---24918896540.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751721bc27b---rafiredawadolipakefota.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/30111035167.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf04e3afce---tiregivigulofezorogefer.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/45496616162.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae298b858f7---dapifepibupab.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/zorita.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/45830998862.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/81976565618.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/45970357860.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/83701151090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=times+tables+grid+blank+pdfPDF 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_off0000d173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD173 10916 bytes
SHA-256: 6b3450c23690680e058ade76109bc87b4bae34e26cc8d9a5632727aa6b58dbb0
font_01_sfnt_off0000ea43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA43 17836 bytes
SHA-256: f4444a3ac0b6f12716cb0e1e14c2400832b2301ee01fe2738f79354ff67b6f30
font_02_sfnt_off0001185f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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