Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba56c400b378ea2…

MALICIOUS

PDF

69.1 KB Created: 2021-09-28 08:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d8b422d8f5e8fdb000a36aeb85fb3f24 SHA-1: d9804549a10c0088a2762ce995bd64a806da064b SHA-256: 3ba56c400b378ea2ba6e8ec3494f4842adbf4efb235ce367b4d15026860078e6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to trick users into clicking embedded links. Multiple heuristics indicate a link farm pointing to potentially compromised CMS uploads and disposable hosting. While no scripts were directly extracted, the presence of external URIs and the overall structure suggest the document is designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ownlines.com/upfiles/file/kibusuvasovaf.pdf In PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4ecc5ab66ffc67853c81242a3509f6ba/12150510907.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109080159136862.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/taxerorotu.pdfIn PDF document text
    • https://andhimazhai.com/images/files/vexewimisavemekow.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/56879751916.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/nonodiz.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/17530198273.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-3/20210903124450522631.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/tesorepezulowonofifimoma.pdfIn PDF document text
    • https://photofetimages.com/82309296501.pdfIn PDF document text
    • https://koratspring.com/upload/file/73010971616.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa2dfd10dc---3479647139.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/zexoz.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614b4a454ea54---64004890135.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/57939808779.pdfIn PDF document text
    • https://webrobogo.hu/kepek/xuxomowefazile.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9011279fb---49768831920.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/12152790012.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/foxoxuxugedawolimexukax.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109131150531008.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a24e8e75328b94dda87d3dfabcba1ce6/pomuxawozad.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/75200686432.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/pigodeju.pdfIn PDF document text
    • https://robertbah.si/files/file/vogidefiwanosubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=striker+soccer+america+2015+mod+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_off0000b0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A4 11120 bytes
SHA-256: c381d3ae4c0e09fdc3da56c213628ce8ebfced5b014272aed28f5aeebb57d947
font_01_sfnt_off0000cac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D2 13772 bytes
SHA-256: 0890e0a796a429c2ca109513ac28360256327317bf9d433d787e0627dce6d090

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