Malicious PDF — malware analysis report

Static analysis result for SHA-256 babe31857adb221d…

MALICIOUS

PDF

94.1 KB Created: 2021-08-09 20:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f96c4e6f6f5cae67955d37307e094d7 SHA-1: 86107c878f97e123ba75c82b9e8fbf9b1d972a87 SHA-256: babe31857adb221df24d2a88499b31a78a23b9b89281b311917e6a51a4f78394
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070704fb04a2---71563506055.pdf In PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/tunobenedufanosulofe.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54970e2045---83483968857.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99e958d20c---lediwitibu.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/bajajugal.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/vufazezo.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/56937473595.pdfIn PDF document text
    • http://web68s.com/upload/files/54237457480.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/0b7f461c670caa755ab11c0e3a65a72c/8043041859.pdfIn PDF document text
    • https://network-italia.com/file/jobigani.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/vevululol.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/jalufibe.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202108050022088854.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/71612753954.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913056ed8a2---70939072049.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/80392179119.pdfIn PDF document text
    • https://pharmalogindia.in/ckfinder/userfiles/files/fajixuzisimemuzalus.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16086801b726f8---xorukafem.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075b55aaaf10---rivejogaraketuj.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/db2be921a8f23937c4ebea2702177b44/pugupozidaxuzojazozogus.pdfIn PDF document text
    • https://areicon.com/images/file/wikusu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rnegrpr6k2fvbjm8gkitkne0g1/gunopajugo.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/789d6542738ce1141d7fca442252b7e8/58937409657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=best+audio+wizard+settingsPDF 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_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 18132 bytes
SHA-256: 6587011c9b8845ccdd55f1831788c35eac42e7e5742c7c1fe469f8455e9ce8e6
font_01_sfnt_off000138d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150EB 10676 bytes
SHA-256: 4c6c8ce66c316047aed0f4a0c0a5671de185d2ff87f882dd4168df59ca366cba