Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ca562a1e646771…

MALICIOUS

PDF

74.4 KB Created: 2021-09-01 19:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4ff34ae35b00bbc9bc09bdf54d18b0e4 SHA-1: 09b21575ae80f6e61c8d054ebae58c31ec3c08d0 SHA-256: 77ca562a1e6467719d1caf3053bbeadf72c04e0e85ed78013dad6e39d0e64bf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cestovni-postylka.eu/userfiles/file/zaduvitekolasawesutu.pdf In PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210621151727.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/58960957767.pdfIn PDF document text
    • http://sdes.in/uploads/bapadasoguduvaduxixoto.pdfIn PDF document text
    • https://digireg.org/upload/xirepazaki.pdfIn PDF document text
    • http://hkacca.com/userfiles/76129330951.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/34349146446.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/14738913929.pdfIn PDF document text
    • http://gibson100.com/clients/870224/File/987987609.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/p3bv68l9dei1ehffmu8hbllk0l/vafalevan.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607603a011138---ritaketotoliwebunuwodab.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/a788847732edb2e174859f3a7dece773/migegasaxosaki.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845cf1f047d---72615952687.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861d09a26fd---tesodapenobizeb.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210527_004300.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/526c76ed69c79175d4acacc4b36f5d0f/96330947125.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/37509740478.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e66b0776b0915bd04a526bc9275b5f66/95177150276.pdfIn PDF document text
    • https://tivicom.vn/upload/files/28505765774.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/2qdvs10ql65jsq0qb2jne89jb5/pirugonovusegodoxuw.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/16354511169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=company+ownership+business+plan+examplePDF 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_off0000c384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC384 10992 bytes
SHA-256: d19f05cfb1c9ce3bc18ea142cfbbc38110ae4f551193f6b1606a035da1be6200
font_01_sfnt_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 15372 bytes
SHA-256: c7fffe1326635d15b63fe476b6e3e17873b37330f25752951513a67d1830ab9e
font_02_sfnt_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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