Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c0c56458d51af26…

MALICIOUS

PDF

74.1 KB Created: 2021-09-25 18:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3f3c053f910915ec215d5768a80fcc6 SHA-1: a3a5d2dfecfcb8a62851d889e6eb41982cdd7ee8 SHA-256: 7c0c56458d51af26d56200c57a9b2de0ee77b667b3649f710ae2db7ebace3cf1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous links to compromised websites, including one hosted on a compromised WordPress upload directory. The presence of these links suggests the document is intended to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 http://studiofapas.it/userfiles/files/43528017407.pdf In PDF document text
    • http://cnokorea.com/userfiles/file/63057680400.pdfIn PDF document text
    • https://premium-house.uz/images/file/52087508258.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/15277176202.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/v5joa7jte29hjdbkma51ggh955/84072894392.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/o082f91aj6f013pg1s1sir6icr/40369185608.pdfIn PDF document text
    • https://fratellifurloni.it/file/3102267638.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/80734447739.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/dopetodawajemuwefe.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/98805248218.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fba02056c6---22573430435.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/56626287192.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c99937301c---39938163629.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/dawefosoguxep.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210910175906173.pdfIn PDF document text
    • http://abc-tel.ru/data/File/fukolitetaluzem.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/98767692230.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/94285842978.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/8652741854.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/sopidowovak.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/vivepisalumufew.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/59487492693.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/82280201094.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/nibopanuximamixaruxol.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/61353587e6bef.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/wetemape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=christmas+activities+worksheets+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_off0000b800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD017 11008 bytes
SHA-256: 2bb051217267331b2c13207cf3c59efd203e4df806ea1d40451374838f69a305
font_02_sfnt_off0000e9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D1 19124 bytes
SHA-256: 325bd2a9f81de88610f3f94c2965c8c3d9617d67632f9d0827575025ffa76db0