Malicious PDF — malware analysis report

Static analysis result for SHA-256 52dd3c8274bc9642…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 07:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3384c420b2fa877550baa293189f5b01 SHA-1: f1bab96ce125fea35b62c12cae1e97e890e119b6 SHA-256: 52dd3c8274bc96426871257cd2356d90cab1dc46e830c25346e46b28057b2354
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics identified the PDF as a link farm pointing to compromised CMS upload storage, suggesting a phishing or malware distribution lure. Although no scripts were directly extracted, the nature of the URLs and the detection names point towards a phishing or trojan distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/96cc6479a4583ada64632c9c7f74818b/vunixudexatoxixorax.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076be9ddf9b1---3845367367.pdfIn PDF document text
    • http://sksound.com/userfiles/file/74212120934.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/42199816185.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6bf2facd89---10319972557.pdfIn PDF document text
    • http://innersolutions-uk.com/file/boruwip.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f31bdcd4f---kozawo.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/91123606480.pdfIn PDF document text
    • https://ms02bet.com/contents//files/vekefilibirebisewakerabor.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/mobodoj.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6d33434e8---73039597943.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/38966354546.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/36911418797.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2ac456822---zopiput.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f633ccb55ab---lidejokavajerax.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/zivonis.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/motirixabupupewepoz.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ebc58ce2bbdcd15bac3321b96693e39a/jotukogebozubovow.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/be79a228eebed050e16b4f2901259a4a/kifefako.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109020647454801.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///81849707684.pdfIn PDF document text
    • https://kermanrooz.com/img/files/meginorepigenudapesa.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/94b46b04ca32b407661472c7e645e2da/rujiwenanogivodijasog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ejercicios+de+enlaces+quimicos+para+secundaria+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_off0000d7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F4 19972 bytes
SHA-256: 8841a7f6094f2992ed600f1a14ead05a5ddebdc123d7df279ca9c1ac7d697223
font_01_sfnt_off00010a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001222a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222A 11040 bytes
SHA-256: 8e70e5b08db19c3fdf38fac750bf88c990a364309d9d02f0ae5f81db616772f1

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